This brake rewind tool from Laser Tools features an adjustable adaptor that will fit pistons with a pin distance between 20 - 35mm - this covers many popular vehicle applications. The rewind tool is of a compact design and will fit smaller calipers like the Mini for example.
I brought this to do my smax brakes it works very well ,
hardest part was pulling the spring back and fitting inside the caliper as the caliper moves which made it a 2 person job