I gave up looking for a deal on a decent bench grinder, and bought a $40 Ryobi from the big box and a tool rest and Norton wheel from Lee Valley. The Ryobi worked fine out of the box, it gets really hot with no load, and the tool rests are just stupefyingly useless, but it has negligible runout or vibration.
I went to put the LV/Norton wheel on today and it was looser than a (insert obscene metaphor). Of course, I assumed the allegedly 1/2" Chinese arbor was out of spec, but Messrs. Brown and Sharpe say it is dead on, while the Made in USA by Norton exclusively for LV bushing is .615" ID.
Not blaming anyone, but you know what they say about assumptions...
Anyway, do I have to laboriously track down a 1" to 1/2" bushing, or order something from McMaster-Carr, or can I just shim the bushing with a couple layers of duct tape or something? If I do have to buy something, does the material matter? (E.g., Delrin, ABS, steel....) I just need to get it centered until flanges clap down on it, right? My normal inclination is to hack away at stuff like this with materials at hand (duct tape!), but I don't have a lot of experience with bench grinders and I don't want to blow up a wheel in my face at 3600 RPM.