Very good recommendation to fit the grommets!
Recently I had my BIL (industrial electrician) visit and while here he checked over my tools and found that one of my DeWalt RADS (1970's versions) had worn through the outer insulation on the cable from the arm to the motor & had started to wear the inner insulation. That RADS has done a lot of work on house sites when we used to cut frames pre trusses & wall frames and then in a truss plant cutting webs etc for trusses. Everything tested OK on both, but that doesn't meant that a fault can't present in the near future.