[porsche tech]

I’m considering getting a saws all. I have a Black and Decker that I found on the side of the DC beltway 25 years ago (or more) when my car broke down. I put new brushes in it and it works when it feels like it. Today it gasped some smoke out so I think it’s at the end of its life. I need it to cut roots out from under my paver driveway, that tends to buckle up when a root pushes it from beneath. Remove a few pavers, cut the root and put the pavers back down. Angle grinder might work but mine are all pneumatic. What’s the best and most cost effective saws all for a once every 3 years kinda job? Any recommendations?