I need to make a valve spring compression tool and your design is excellent. I have a couple of questions: What is the length of the arm to the compression screw/fork, and is there enough clearance to use the tool with the engine in the frame? (Tank and head off of course).
I have one like Hans's that is actually a proper valve spring compressor (vintage UK made thing!) I only want £5 for it plus the postage at cost price please PM me if you want it