I came across this idea yesterday needing to make a leveling rod assembly for my MTD 990 deck. It could also be used making linkages. Using foundation anchor bolts, these are 1/2" diameter & come in 6"-10" & 12" lengths. If you need a length in between these sizes you could as I will have to do is cut the threads deeper down the shank & cut off the extra threaded length. You could simply drill the appropriate hole for the pin. They are usually a few bucks with nut & washer.