Some how I misplaced my Dremel (Sears version) that I have had over 20yrs. Were I worked we would go through about 2 a year do to miss use, mostly over tightening the chuck. I always replace the chuck with a keyless chuck. I bought a HB cordless and it would not even charge. Returned it and picked up a corded one. The keyless chuck has different threads so it won't fit. The adapters I have different shanks sizes won't fit either. Wish I had my Dremel back.