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Cannon Pinion Tightening Tool

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I seem to be having a run of loose cannon pinions, especially on small calibre (ladies) movements.  Don't have a tool for tightening so would like advice for suitable tool.  I have seen the Bergeon pliers type but wow are they expensive!  Do not want one that needs jeweling tools etc to use it.  Any suggestions/sources most appreciated.

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Hi  There are some which come up on Ebay  that are like a small chisel like punch on a small chisel anvil for pinching the cannon.  I have managed it with a pair of top cutters that are blunt but its too easy to over do it. If you have a staking tool you could use that with the appropriate stake and punch.

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Thanks for your responses.  I will keep an eye on the bay for a proper tool. In the meantime I have some old nail clippers and have flattened the cutting edges on it.  I might try and drill a hole and fit and adjustable/locking screw for better control (not sure if the material might be too hard to do this.  If not I'll give it a go without.

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Here are some pics of my nail-clipper mods, for those hobbyists who do not have lots of cash!!

Only cost would be for a suitable drill for the setting screw hole (tungsten carbide needed as material of arms is very tough), the rest from the 'bits box'. The original pin for the lever was 5mm diam hence the crimp screw diam, this could be different for other clippers. Any epoxy would do but JB weld sets very hard. The setting screw can be any size provided it does not compromise the integrity of the arm (ie weakening it across the arm) and the locking nut fit re fouling the crimp screw head.  The crimp screw could be in the other way but thought easier to have both screw heads on same side.



3. TOOL.jpg

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