DiamondTech Diamond Max Bevel Max 2 in 1 Stained Glass Grinder
Has the 1" round bit and the flat disk grinding wheel
The flat disk grinding wheel has separated so you will need to put another one of those on there, I may have a used one somewhere, I will have to look.
However, in order to change that disk, you need to remove the 1" bit on top, I cannot get that off, it has an allen set screw, maybe you can get it off? If you can, you can replace the flat disk and you'll be good to go.
A while back I plugged it in and it turned on, now, it does not, I believe that the power switch is broken, so you will have to figure that out.
This thing is about $400 new