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I'm installing a Shimano UN-72 bottom bracket into my Merckx MX Leader frame. The BB is the correct Italian size (36x24, 113 since I'm running DA 7402 cranks), yet when I try to install the drive side it threads on normally until about half-way, then becomes increasingly more difficult to thread until it's basically immovable with about 3-4 threads left showing. I've yet to try the adjustable cup left side.

Does anyone have any idea why this might be happening? I was worried about cross-threading so I was very carefuly when I threaded the BB into the shell, and I wouldn't expect it to thread half way into the shell if it was cross-threaded. I've cleaned the threads on the BB and re-greased them just to make sure there are no burrs or impediments and for the life of me I can't figure out why it's not installing. :mad2:

Any help or advice would be greatly appreciated!
 
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