I use a 1/4-20 Tap into the wood blocks and reinforce the threads with CA...like these guys have been saying. I personally think it's the best way to go, but if you do want to use blind nuts....make sure you use regular steel bolts to SEAT the blind nut. You want it to be well seated, and you want it straight in the bore. You won't be able to achieve this with the nylon bolt. After it's seated, your good to go with your nylon bolts.