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Look at the tube that connects the gear packs on both sides of the slide. At each end is a 1/4" bolt that SHOULD act as a shear bolt. Normally, shear bolts have a smaller diameter at some point along their length, which is where it should fail. Mine was a standard bolt, so the gear failed first.
Shear bolts are available at most hardware stores, but I'm not sure they are designed for this application. I've heard of people using grade 2 bolts, which are weaker than grade 5 or 8. Some people have ground grooves at the appropriate points in the bolt to make sure it will fail.
It's easy to measure the free end of the gear pack shaft to know where to put the grooves, so I guess I'll make up a bunch of them before our next trip.
Bob
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