We used to just use the hex / socket bit on the drill when we had that set up. One socket for all 4. Jacks had the hex head as it looks like yours did. They sell the drill hex / socket set up for a drill now, in one piece, for $10. but who wants to spend that when you have it laying around your shop.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.