Offset Cannon Pinion - Any tips on how to remove?

Tweezers on top of the wheel pinion, and then use a Presto style hand puller to grip and remove the cannon pinion.

You are glutton for punishment!😲

I won't touch these anymore...between the sealed mainspring barrels and offset cannon pinions, neither of which are easily found these days, it's not worth the time. Many people like to look back on the good old days of watchmaking, but honestly some of the designs out there from the past are just awful.

But they sure are cool looking

In my experience, this is a bad idea.

Well, most companies sell complete barrels, so that in itself i not a problem. It's the sealed barrel designs that can't really be opened (or closed) without damaging the barrel. I find the Zodiac calibers had the outer edge of the barrel wall sort of burnished over the barrel lid, meaning that it was going to be very tricky to get the barrel opened, the old spring out, and new spring, and get it closed up without having damage occur. Might not have been all of them but I recall one that was a triple date with moon phase that I worked on that was like this.

Longines and Bulova also used sealed barrels...and thankfully after a time they went out of use.

By the way, what is old is new again - the new Rolex 3235 the barrel can't be used over again. Not because it's a "sealed" design, but because they reduced the wall thickness to fit more mainspring in (a cheat to get a longer power reserve) and in the process made the barrel wall so thin it can't be closed without damage. Fun times...