reposting theis at the request of aother member.
not.. this is a light duty lift meant for a couple hundred pounds.
currently the rockshaft is 3/4" and is doing fine. I have since located a 1" rod, and if the rockshaft does bend, will swap it out for that.. etc.
I originally mocked it up using scrap rebar to get my angles and distances correct.. then went back and used better metal stock and clevis ends, etc.
unit is working well for it's intended purpos.. I've pulled a spring tooth harrow with it as well as a pasture drag harrow many times.. working great. I wouldn't try to lift a 400# 4' mower with it till I swap to a 1" rocksahft though.
lower draft links are ford from an N.. etc..