there's a fault with 105 front shifters (apart from they are shit and make your bike look like a raindeer) if you can't get the cable to slacken off on the adjuster and get life back into the shifter, there's a part inside which breaks when you try to force the shifter once it has jammed.
Mr smith has experience of this but he's out riding with his Dura-Ace shifters.
there's a fault with 105 front shifters (apart from they are shit and make your bike look like a raindeer) if you can't get the cable to slacken off on the adjuster and get life back into the shifter, there's a part inside which breaks when you try to force the shifter once it has jammed.
Mr smith has experience of this but he's out riding with his Dura-Ace shifters.
warranty job.