US Patent 7938049 Trimmer with quick adjustment feature

An apparatus has a rotatable base having a plurality of guide features with opposed sides and supports. Each of the supports are slidably disposed in one of the plurality of guide features. The supports and the base member have spacer engagement surfaces which are configured to face one another in pairs and to have spacers clamped between each of the pairs. The spacers are so dimensioned as to locate each of the supports in a predetermined position with respect to an axis of rotation of the rotatable base member. A gear train on cut drive side is driven by a variable speed motor. Motor speed can be set for a given can diameter.