I've broken it off twice. First time was when my chain snapped, second time when I couldn't get the chain guard off and it snapped with me bending it by accident. Got it welded back on the first time, but it wasn't a good job, the weld was porous. 2nd time I had it done properly and had the front one welded to reinforce it. Cost me a tenner the 2nd time, can't remember what it cost the first time, think £20. Just find a good local engineering shop and they can weld it in minutes. Offer to pay cash and you'll get a good price.