I am pretty sure someone on here has tried or heard of these, but I couldn't find any posts on it.

I was using a borrowed belt grinder from my next door neighbor (that is until i moved this last weekend) and figured i would have time to build a grinder from the "grinder in a box" plans, but alas I am just not going to have the funds to get one of those up and running.. I found one of these Multi-tool belt grinder and was considering getting one.. they bolt right onto a bench grinder and I already have a variable... the only problem is the smallest contact wheel is 3 1/2 diameter so i would have to find something for hollow grinding..

What do you guys think?