Elm-er Fudd This ^^^^^ After it gets the treatment, you will grab it 1st, unless it's a huge tree you're cutting. PS...get the filter upgrade too.
Better hurry, the 4920 is now a clam shell design, I think. 501P is basically the same as the 4910, but metal handle, captive bar nuts and a different coil, I think. Also $100 more.