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Hi all I'm trying to repair this one for an old Viet Nam marine buddy, who said it hasn't run since the day his grampa gave it to him just before he deployed. What I found was that the upper pivot of the balance staff was gone along with the balance cock upper hole jewel was cracked and chipped. I was able to secure a NOS balance, staff and hairspring assembled, and lucky enough that all the jewels and fits were good. I added a new white alloy mainspring for the heck of it, cleaned and lubed everything. Assembled it and put some power to the mainspring to check it all over to find what I thought was excessive endplay. I took the balance back down and under the microscope to find it looks like the staff upper pivot(or the staff OAL) isn't long enough to fit, or reach into the upper jewel when assembled. Is that possible? is the hairspring collet not staked to the shoulder? (I haven't gotten that far). 1) should I mic the staff overall length and try and find a longer one? 2) I see there are stake marks between the balance cock and base plate seemingly to raise it up or for binding issues. should I blend those down flush? 3) should I attempt to find a different balance/bridge/hairspring assy. and replace the whole thing? it wants to run that's for sure and does intermittently, which, after all the work, is encouraging to me. I'm soooo close. Can I fix this? much obliged- Mike