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Old 04-13-2013, 02:29 PM   #1
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Loose screws

A trailer, be it a TT or fiver, is exposed to a lot of vibrations during its lifetime. This vibration can have a tendency to loosen screws. I have a #2 square drive bit that I use with a 1/4" ratchet. At least once a year I'll walk around my trailer checking as many screws that I can find. Some examples are slide moldings, wheel opening moldings, window frames, and numerous trim moldings. Many can be tightened a quarter turn or so; but I am very careful not to over tighten them.
I started doing this on my first TT when I noticed a couple of screws ha fallen out.
Just a helpful tip I hope might help.
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Old 04-13-2013, 02:41 PM   #2
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Good advice - one morning the DW found one of the two hanging lights over the dinette table hanging by its wires. The lights are those kind that are fastened to the ceiling with a receptacle that the light rod screws into and is held by a small screw. After finding and re- installing the one screw I checked the other one and found that one loose. I carry a combination Phillips/common head screwdriver with me and check other screws - I found the screws holding the shirts around the wheel wells to come loose also.
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Old 04-13-2013, 04:07 PM   #3
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Phillips vs Roberson- big difference

Came across this comparison today. A Phillips driver can ruin a Robertson head.


Phillips drive tool and fastener sizes[4]Tool sizeFastener size00–112–425–9310–16418–24
Created by Henry F. Phillips, the Phillips screw drive was purposely designed to cam out when the screw stalled, to prevent the fastener damaging the work or the head, instead damaging the driver. This was caused by the relative difficulty in building torque limiting into the early drivers.
The American Screw Company of Providence, Rhode Island was responsible for devising a means of manufacturing the screw, and successfully patented and licensed their method; other screw makers of the 1930s dismissed the Phillips concept because it calls for a relatively complex recessed socket shape in the head of the screw — as distinct from the simple milled slot of a slotted type screw.
There are five relatively common (and two rather uncommon) Phillips drive sizes that are different from the screw size; they are designated 000, 00, 0, 1, 2, 3, and 4 (increasing in size).[4][6]


Close-up of a Robertson screw

A Robertson, also known as a square,[18] or Scrulox[19] screw drive has a square-shaped socket in the screw head and a square protrusion on the tool. Both the tool and the socket have a taper, which makes inserting the tool easier, and also tends to help keep the screw on the tool tip without the user needing to hold it there. (The taper's earliest reason for being was to make the manufacture of the screws practical using cold forming of the heads,[20] but its other advantages helped popularize the drive.) Robertson screws are commonplace in Canada, though they have been used elsewhere[21] and have become much more common in other countries in recent decades. Robertson screwdrivers are easy to use one-handed, because the tapered socket tends to retain the screw, even if it is shaken.[21] They also allow for the use of angled screw drivers and trim head screws. The socket-headed Robertson screws are self-centering, reduce cam out, stop a power tool when set, and can be removed if painted-over or old and rusty.[21] In industry, they speed up production and reduce product damage.[21]
The internal-wrenching square socket drive for screws (as well as the corresponding triangular socket drive) was conceived several decades before the Canadian P. L. Robertson invented the Robertson screw and screwdriver in 1908 and received patents in 1909 (Canada) and 1911 (U.S. Patent 1,003,657). An earlier patent for square-socket- and triangle-socket-drive wood screws, U.S. Patent 161,390, was issued to one Allan Cummings of New York City on March 30, 1875. However, as with other clever drive types conceived and patented in the 1860s through 1890s, it was not manufactured widely (if at all) during its patent lifespan due to the difficulty and expense of doing so at the time.[20] Robertson's breakthrough in 1908 was to design the socket's taper and proportions in such a combination that the heads could be easily and successfully cold formed,[20] which is what made such screws a valid commercial proposition. Today cold forming (via stamping in a die) is still the common method used for most screws sold, although rotary broaching is also common now. Linear broaching to cut corners into a drilled hole (similar to the action of a mortising machine for woodworking) has also been used (less commonly) over the decades.
Robertson had licensed the screw design to a maker in England, but the party that he was dealing with intentionally drove the company into bankruptcy and purchased the rights from the trustee, thus circumventing Robertson.[citation needed] He spent a small fortune buying back the rights. Subsequently, he refused to allow anyone to make the screws under license. When Henry Ford tried out the Robertson screws he found they saved considerable time in Model T production, but when Robertson refused to license the screws to Ford, Ford realized that the supply of screws would not be guaranteed and chose to limit their use in production to Ford's Canadian division.[22][23][24] Robertson's refusal to license his screws prevented their widespread adoption in the United States, where the more widely licensed Phillips head has gained acceptance. The restriction of licensing of Robertson's internal-wrenching square may have sped the development of the internal-wrenching hexagon, although documentation of this is limited.
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Old 04-13-2013, 04:30 PM   #4
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Anyone who tries to use a Phillips to turn Robertson should not be allowed to carry a screwdriver or any other tool.
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Old 04-13-2013, 11:12 PM   #5
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What I would have done for a few stainless steel Robertson's today for a project I was working on..... Finally got the Phillips screws in place by using a dab of plumbers putty to hold the screw on the bit while I got it into place.... Robertson's would have been PERFECT, but the only Robertson heads I could find at Home Depot were deck-screws!!
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Old 04-14-2013, 07:42 AM   #6
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Those Robertson square head screws work way better with powered screw guns than Philips head. I did deck repair last year on my house and it was all to obvious why square heads are being used nowadays. The Philips screws strip out too easy.

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