mont49

I have a Juki 563 machine that I have replaced the lower drive shaft. Now I need to sync top shaft to it, and not sure how to do that. The procedure to sync top and bottom shaft uses the two lines on castimg with take up at highest position. But I have loosened all bushings . I need advice on how to complete sync. thanks, I am new to this forum, located in Oklahoma, I do a little work on boats and leather as a hobby. thanks