stockesp

Vice grips are great for the easy extraction but my favourite is the fine blade high speed cutter cutting the slot for a flat blade screwdriver like Bear said. Another is drill out as much of the broken fastener and use a tap to remove the remaining thread. Heat gun on HOT is very useful but above all, patience.

Hi all, I've done this quite a few times by gently heating the adjustment knob with a heat gun and pulling straight off. Install is just pushing straight back on, hope that helps.