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I can't answer your question right now but I have these in my Seitz jewelling tool and my impression is that they are made for large, pocket watch size, cannon pinions. I prefer the Cannon Pinion Tightening Tool, Bergeon 4733. Perhaps the pusher and stump could be dressed to work better with small and normal cannon pinions!?
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Hi there thanks again for your help... I don't think it's that staff. The broken staff measures (with a tolerance for my crude measuring) A=402(but has a pivot missing) B=173 J=132 G=56 K=93 The A length seems too small....but the best fit has the right keyless works.....I wonder if the keyless works is common to another calibre? Just for info the balance cock is original as the machining pattern on the movement matches...so I'm assuming it isn't a '**BLEEP**' movement. This is why it's stumped me! 😁
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By Neverenoughwatches · Posted
Due to the nature of the steel intended for its use it will have some hardness, but not that hard. I've chipped the sharp cutting edges of loads of these . Your drill bit is probably slipping on the shiny chrome plated surface, it wont bite until it gets through that. Try a center punch or otherwise cobalt or carbide bits. -
A recent lathe purchase ( Pultra P type ) I have a thing about Pultra lathes turned up something I have no idea what they are for. they don’t look shop made but could be . Dell
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By Neverenoughwatches · Posted
I thought about if Ross could carefully drip alum into the hole to dissolve the screw so the outside of the arbor is unaffected. It risks the arbor thread but with the arbor being hard and the screw is soft maybe the screw would dissolve before that happens. Not sure if Alum reacts to the carbon content in which case the arbor has more than the screw. Re-threading the arbor would be a problem. Might be worth an experiment, i have a few hundred random arbors, shame there isn't an arbor database like there is for staffs 🤔
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