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LH crank arm on a non shimano HT2 crank? Seen plenty of them off amazon/aliexpress recenty, some with 3mm head allen bolts, joke! If its one of those then likely just replace the crank arm or set, new bolt will only break again as they are just engineered/built wrong.
Standard snapped bolt etiquette...
Centre punch bolt from the side of the load, to loosen it in threads, then try and twist out with
good pliers (Geodare/knipex etc)
If its a proper drill out job, unless you have a pillar drill and work holding devices and your time is worth nothing, your better off getting a new crank arm.
BrickMan
user117538
Morning all, I've had a nightmare and snapped one of the two crankbolts on some cheapo hollowtech cranks. Longshot but is anyone in Herne hill area able to give me a hand extracting the snapped bolt I've already had a go with a bolt extractor and no luck.