Here is a simple method to produce your own drive belt changing tool at home in the garage with basic tools: 1) Use a 3-1/4" holesaw to cut a circle out of 1/4" flat stock, then drill and tap M6 x 1 bolt holes on the outer edges. Make sure all three holes are in a straight plane. 2) Drill the center hole out to accommodate the diameter of the secondary retaining bolt. 3) Once installed, use a 10mm wrench to turn a fully threaded bolt (50mm length minimum) against the helix and open the sheaves. Only one bolt is needed to open the sheaves. I drilled and tapped a hole on each side in an attempt to maintain balance. The M6 bolt needs to be removed and stowed in the trunk during operation!