I have been looking at nipper alternates. This is the best candidate so far. A Walmart "Hypertough" brand angle grinder and 1.5 amp.hr li-ion battery , (about $40) and a flap disk about $10. The gold colored wheel has more aggressive teeth, but it tends to jump, when used single handed. The abrasive flap wheel is smoother in the hand. I was pleased to find my horse does not mind the high whine of the spinning wheel. The weight at four pounds is as heavy as you can willingly hold for a few minutes.