Looking for a sprocket for a Redmax GZ4500 and nobody around here seems to have it. I thought I found one on 'the bay but the ad said it would also fit on a 346xp. I looked at the 346 sprocket and the shaft diameter was about a half inch which is too large for the Redmax which is closer to 3/8'. Anybody else run into this? Most of these saws use a spur sprocket since the oil pump runs off the sprocket, it just slides into the worm gear..