Thank you so much! Your tutorial with the pictures was great. Fixed the problem of the piston sticking. I wanted to make a note to put the black square part into the notch it was in on the body so the spring has something to work against on the retraction. I missed that the first time and it didn’t retract. Glad I hadn’t put the screws back yet. So I re-seated the assembly and tested while watching it then put the screws back. Thanks again.