Grumpy gumpy
AH enthusiast
I used 1020 mild steel for the heads with two pin holes to tighten them, and ground a screwdriver bit to suit. The cross shaft is a bit of 7 mm key way stock. I have used 1095 which could be hardened but it was not worth the effort. If you shear off or strip out the threads you are doing it up too tight, they should be firm. The wood will move so you don’t need it too rigid. I rust blued the heads
Gumpy
Gumpy