I changed some things, I used this picture and the original paten drawings. I used a little artistic license and combined the two. It is after all my shop and railroad. We use what we have and like. Be aware that the Railroad is just about broke and doesn't have a lot of fancy machinery. Also the shop foreman/crew has some limitations/libations at times.. NOTICE here at the RR we are firm believers in angle grinder engineering. Why use a machine or machinist when a grinder is at hand. Interchangeable parts is a concept that is unheard of out here in the back woods. All of the parts started out as raw stock. Nuts, bolts, lumber. I did buy some chain and clips at the end of the chain. I tried making the chain but it was not going to happen. I don't have any shop elves that will help. I only have Leroy, he is the one dressed in brown. But he stays on the bottle most of the time. That would explain some of the not so straight lines and the heads of the hand forged bolts and nuts not being the same. He is on the payroll whether we have legit work or not. He was responsible for the hundreds of bolts and nuts. We have a well stocked junk yard.