I had not had the opportunity to use since its purchase arbor! so I just (try) to make use .................. this equipment was assembled incorrectly by the manufacturer, which caused the fracture of a joint, by Furthermore this article is of very poor quality, (the feet are blocked and refuse any contribution mounting ..... the sliding parts do not slide and get stuck into each other, etc ..) unlike the arbor I bought 6 years ago and I used with no problems until recently, this model is permanently unusable! to avoid absolutely!