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Does anyone know what size the limit screws for a Shimano 105 front derailleur are? M3 is definitely too small, M4 seems slightly too large - they engage for maybe a threat but tilt, and it doesn't feel right. There's also this weird little plastic thing where the two screws pass through (no threats) before engaging in the FD. There too M4 feels to big, the diameter of the holes is between 3.6-3.7 mm - the M4 measures to just under 3.9 mm. Any ideas?