Here's what happens when you use a bolt:
Winch Fragged
My A3 has the hydraulic setup but the pressure valve seems to be set pretty low so the winch doesn't have that much pull to it, at least in terms of trying to pull out stuck farm tractors, even using the G.I. block...
The solution for those of us trying to pull big things out of where the shouldn't have gone, as opposed to pulling ourselves out, is having several blocks on hand for the job, NOT back at the shop, hanging in the barn where they are safe!!! Blocks are where you find them, just missed a few by running errands instead of stopping RIGHT THEN at the roadside junk-sale, they were gone an hour later.

Keep your eyes open!