Snail Spirals

I was all set last night to spend the whole evening bonding with my lace flyer. I predrafted three nests of fiber, oiled up the wheel, and had a bunch of Stargate SG-1's ready to go on TiVo.
Then, as I started to treadle- disaster! I was treadling, but nothing was happening! The drive wheel wasn't turning! So instead of having a lovely spinning evening, I had to disassemble my wheel and it spent the evening like this:



The cause? This:



The main screw that goes through the drive wheel and crank and attaches them together was neatly sheered off on both sides of the crank. To say that this is a very important part is an understatement.

So I spent the evening doing hardanger instead, and am now off to the hardware store to hopefully find a replacement screw.