Hi all new to festool and this forum, just bought a ps400 carvex jigsaw from an ebay auction, tried it out on 9mm mdf and the blade wanders all over the place tried it on 40mm maple and the same again im using festool blades, is there anyway of returning it to festool as its been bought in an auction and i dont have the warranty, also what does the level on the left side labeled 0-3 do?