Alot to like here! Nice welds, fit&finish. A couple of things to think about though. In the first picture, ram comes very close to, or in contact with the arm. Make sure it does not ever hit it. In the second picture, is that fully retracted? If so, it may drive you nuts after a while. IMHO it hangs out to far. Should be tighter to the boom. I make my own thumbs as well, there is alot to think about when doing one. There will be a relief valve already in the circuit for aux, what I think you mean is a crossover valve. Its purpose is so the thumb does not overpower the bucket. The bucket needs to be able to push the thumb, but not vice versa. I did not install one on mine, I just set the thumb and bucket into it. I am also the only one to run the machine too. Anyway, NICE JOB!
