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Howard
M_V
Yeah, the grub screw style seems pretty problematic.
The track tandems at work have that style and I hate it. Very difficult to make small adjustments as the grub screws want to pop back into the indentation they’ve already made and the soft alloy of the insert tends to burr up around the bit where the grub screws hit which causes the insert to jam, like yours has now.
I don’t believe there’s any reason other than financial to go with grub screws.