• Looks and sounds like you’ve narrowed the problem down. I can’t immediately recall having come across this with Shimano shifters, rather the opposite that the ratcheting mechanism no longer engages or skips clicks. Would be interested in what else you find.

  • The tension spring is pushing that lobe down further than it can go on the 105 unit which is why it's fouling. I need to get another unit to compare it.

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