a harder aspect of this design was manipulating the 1 1/8" steel block. it was a pain to cut. Forunately, I have a lot of tools and was able to get it cut to the size I needed. Also, I have a harbor frieght mill/lathe I bought years ago, which allowed me to cut the clearance slots and trim down the block. I am not a machinist but was able to muddle through it.