I made this tool to windback the pistons on my vxr after doing the rear disc and pads. Cheap and easy given halfords want £33 for the proper item.

The black metal goes on the inside of the caliper and the two bolts hold it level. Then turn the bar to press against the piston, lightly.

The metal handle is what u use to take the discs off a grinder, the two small metal prongs fit perfectly in the piston slots.

Tighten, half turn piston, tighten, half turn etc. Takes about 3 mins aside.

Might be helpful to someone out there.