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I had a request to add a recess to the butt of the ice fishing rod grip set I have posted.  I took my design and added one to fit a 20mm cabochon which is typically used in rod building.  I also modeled this one to fit an ice rod that i had on hand that had a butt diameter of 6.4mm.  If you are needing another diameter let me know and i can quickly update the original file.

 I didn't have one of the 20mm cabochons on hand to test the fit, so if for some reason there are issues with it, please let me know and i can change the design a bit.