OK. we've all been there. You're trying tp disassemble or reassemble your forks and that bottom Allen bolt just goes round and round. Nothing is happening as it turns the innards with the bolt. No matter how hard you try to 'shock' the bolt, it still just goes round and round.
I was putting my forks back together this morning and I thought I'd take these photos This might help others that are faced with that miserable bolt not wanting to cooperate.
Tools you will need:
A 2 foot length of 3/8 pipe. Optionally you can use socket extensions snapped together. I used to use an 18' and a 4" together.
A furniture clamp (available at Home Depot) with a length of 3 feet or more. I don't have a 3 footer, but I do have a four.


Slide the pipe in the fork up against the damper


Now get the clamp and clamp between the open pipe end and one of the axle studs. Tighten securely.


Don't forget to leave room for your Allen wrench.


Now it's easy to extract or install the Allen bolt. Tighten to your hearts content. You have locked the internals in place and they will not rotate!

Hope this helps next time you face that job.