How difficult is to find a column wheel for a 321 movement?

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Asking because I need one to complete a movement...🙁

Couldn’t find one in while on eBay (excluding entire movements). Is it as hard to find as I suspect?

Thank you for your insights
 
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Very easy. While it is referred to as a column wheel. It's also called (it seems) the Pillar Wheel

Part #1715 and there are about 6 on Ebay. Also available from parts suppliers, but higher price

DON
 
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I’m once again amazed by the collective knowledge of this community. Even more by its capacity of sharing that same knowledge