and the good news is…
[i]There were a few iffy 105 shifters that snuck through last year (the problem has since been resolved). If he removes the problem STI and sends it back via his LBS to Madison warranty Milton Keynes we’ll replace it free-of-charge under warranty. The shop will need to ring through to customer care first for a returns number first though.[/i]
so it’s not your beefy hands that are at fault, it seems