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I bought off the shelf items to attach a split-lap felt wheel on the leather wheel side of the Tormek to sharpen serrations (as per Wootz' video). It takes minimal time to switch out the leather wheel and could work for you too.
All that's needed is a M12 bolt (length determined by felt wheel thickness), 2x M12 flat washers and a M12 40mm coupling nut. Here are a couple of pics.
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Andrew
Good idea, Andrew. Using the off-the-shelf M12 coupler has great possibilities, as you have shown. How does it track in perpendicular rotation (wobble)?
The felt wheel I use is 1" wide and has a 1" center hole, for which I've turned a bushing. When mounting it on the grinding wheel shaft, I use wide flanges, that I machined to support it and hold it somewhat square/perpendicular. I can see modifying the M12 couple by turning the hex off of a portion of it and using that as a mounting shaft, with the flanges.
Curtis (cbwx34) came up with the idea of using the extension shaft from the Leather Profiling Wheels (LA-120) for that purpose (see photos). I have the LA-120 and was planning on using the extension shaft. I've not tried it as I've been so busy with other things and haven't been doing any sharpening for a while. I have some garden tools in from a friend to do, but those can be handled on the leather honing wheel as I'm not going for the super sharp edges. If I remember right, the felt wheel/bushing/flanges I have now fit the LA-120 extension shaft, but I may have to use some washers as spacers. I also am a little concerned about the large flats on the extension shaft, but will not know until I try it out.
The M12 coupler, etc. is a great, much less expensive way to do it. Nice work.
Rick