04-29-2012, 11:17 AM
I am replacing my old BB with a Shimano UN26 and can't work out how to tighten the plastic cup on the left side. My tool (UN54) works fine on the chain side but not on the left. I was told at the shop that I just needed to tap the tool to make it fit the plastic cup but after destroying one plastic cup, I am at a loss. Do I need to purchase a specific tool for a plastic cup? I read that the UN26 now comes with an alloy cup that replaced the plastic version.