I have one of these (Tractor Bucket Toothbar). It clamps on using large bolts so any threads are protected (watch the video to see the clamp-on version). One of the main reasons I bought it is the teeth are removable and replaceable. If they break I can get new ones. Also, I often remove every other one for increased digging power or wider-spaced raking. The only downside is with heavy use you need to periodically retighten the clamping bolts or it'll slip off the bucket and possibly bend. For really heavy work I ended up drilling my bucket and just bolting it on. This exposed the threads but I was still able to get the nuts off. You could always add nuts to any exposed threads to protect them. Good luck.