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It's a very simple holder very usable when you have to make a clock or watch pinion with inside divisions.
You can modify the diameter simply with the screw on the center, if it's necessary to be very precise, just use a dial gauge.
http://www.lecollectionneur.ch/_Media/_dsc2300_med.jpeg
Thanks Okapi! I've added your Watch Pinion Holder to our Machining category, as well as to your builder page: Okapi's Homemade Tools. Your receipt:
<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="/watch-pinion-holder"><img src="/uploads/89200/watch-pinion-holder.jpeg" alt="Watch Pinion Holder" /></a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="/watch-pinion-holder">Watch Pinion Holder</a> <span> by <a href="/builder/Okapi">Okapi</a></span> </div> <div class="tags"> tags: <a href="/tag/lathe">lathe</a>, <a href="/tag/clock-movements">clock movements</a>, <a href="/tag/watchmaking">watchmaking</a>, <a href="/tag/pinion">pinion</a> </div> </div> </div> </div>