So, rather than re-inventing the wheel, might i ask what you gents have used in similar situations? I assume most T slot on table saws and shaper and WWing tools is relatively standard, but i am perplexed as it seems i am hunting for a unicorn. Back to the diagrams but not finding something to fit. Went back tot he McMaster Carr site and struggled a bit with the diagrams and ordered some small ones (91523A628 with 3/8'-16 thread, 1 1/2' long)yesterday and was amazed they arrived today (yes, i was impressed) but they are too big. Went to a specialty bolt shop in town but they had nothing suitable. Seemed like an elegant solution, and an obvious choice. I went to the McMaster Carr catalog, thinking i would get hex head bolts to slide into the T slot. I want to invert 2 bolts in the T-slot and use 2 thread-through knobs to tighten down the plywood on top of the cast iron table. I want to make an outboard fence for my Powermatic 2700 shaper.