To give your coupler more of a gluing surface, sand the edges flat with 200 grit on a sanding block.
On the left is the cut edge of the coupler as sent from the vendor. The edge is actually more of a angled wedge from cutting.
On the right is the edge after sanding flat. Enlarge the picture to see the increased gluing area on the edge that was sanded flat.
Ring/Coupler assemblies are typically a weak glue joint. This new flat edge will get you a slightly wider gluing area.
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