Dear I searched for the vedio because I faced same problem by receiving 20mm disc and I couldn't install on my grinder as it requires 22mm, any way I managed today to increase the disc hole size and I found it simple as the center of the disk made from soft metal which is easy to enlarge, I used hole enlarger with drill press and it's was OK.. I just want to let you know
Dear
I searched for the vedio because I faced same problem by receiving 20mm disc and I couldn't install on my grinder as it requires 22mm, any way I managed today to increase the disc hole size and I found it simple as the center of the disk made from soft metal which is easy to enlarge, I used hole enlarger with drill press and it's was OK.. I just want to let you know