Fix for bolt loosening off on exterior steps

[Doering]

The rear bolts in the pictures keep loosening off and falling out. I have replaced with a larger lag bolt and it is now coming out. Unfortunately I can't use a nut and bolt because the underbelly is sealed. Is there a fix for this without having to take off or cut into the protective underbelly material?

[Kaadk]

Loctite? (#WINATGLUE Loctite Super Glue, Sealants, Epoxy | Loctite Adhesives)

[VinceU]

Originally Posted by Doering

The rear bolts in the pictures keep loosening off and falling out. I have replaced with a larger lag bolt and it is now coming out. Unfortunately I can't use a nut and bolt because the underbelly is sealed. Is there a fix for this without having to take off or cut into the protective underbelly material?

Auto parts or big box store "Nylok" self locking nuts. Not impossible to remove but won't loosen either.

[Twisty]

Are you trying to screw in to plastic?

[OldCoot]

Originally Posted by Twisty

Are you trying to screw in to plastic?

It's the frame I beam on mine. I'd just slit the underbelly and put a nut on it and tape it shut.

[Doering]

Originally Posted by Twisty

Are you trying to screw in to plastic?

No, it goes through the plastic liner and then the frame.

[Twisty]

Cut it drill it bolt it forget it

[Herk7769]

I suggest Grade 8 hardware on anything involving those steps.
After the last rivet break, I sucked it up and replaced all the rivets with grade 8 bolts, washers, and lock nuts.