See a great looking, reasonably priced buffing wheel but the hole size is too small ? Join the club ! 
here's an ez way to change THE BUFF to fit yer 5/8, 3/4, 1" shaft and don't have to mess with a shaft adapter (the example deals with enlarging 1/2 hole to fit 3/4 shaft)
- get yerself a set of punches (I have something like http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=3838 in sizes up to 1")
- sharpen the edge on yer belt grinder. Smallish grit, dont burn the steel. Hold the punch horizontal, at may be 25 angle to the belt. Keep turning it as you grind and soon nuff you can shave with that edge. The knurl on these looks terrible, but the steel is fine.
Now the question is : how do you punch out a hole concentric with existing one ? Do it by eye and you will destroy the buff in a second - it is very ez to get it wrong and now you have 1/8 of TRI, you buffer will vibrate like crazy and finish will be awful.
Here's what I did: turn a 3/4 to 1/2 adapter out of delrin /alum whatever.
Have it 1/2 long of 3/4 (slightly under: .745 or so) OD to 1/2 of 1/2 OD.
Now: lay the buff on yer work table, stick the 1/2 part into 1/2 hole of the buff, put the punch so that it slides on top of the 3/4 OD of the adapter and hammer away. I also recommend to have the punch squared to buff as you do that. I use a machinist Vee block.
Brilliant ! Of course, you can as eazily turn adapters of different size (1/2 -> 5/8, 5/8 -> 3/4 etc)
here's an ez way to change THE BUFF to fit yer 5/8, 3/4, 1" shaft and don't have to mess with a shaft adapter (the example deals with enlarging 1/2 hole to fit 3/4 shaft)
- get yerself a set of punches (I have something like http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=3838 in sizes up to 1")
- sharpen the edge on yer belt grinder. Smallish grit, dont burn the steel. Hold the punch horizontal, at may be 25 angle to the belt. Keep turning it as you grind and soon nuff you can shave with that edge. The knurl on these looks terrible, but the steel is fine.
Now the question is : how do you punch out a hole concentric with existing one ? Do it by eye and you will destroy the buff in a second - it is very ez to get it wrong and now you have 1/8 of TRI, you buffer will vibrate like crazy and finish will be awful.
Here's what I did: turn a 3/4 to 1/2 adapter out of delrin /alum whatever.
Have it 1/2 long of 3/4 (slightly under: .745 or so) OD to 1/2 of 1/2 OD.
Now: lay the buff on yer work table, stick the 1/2 part into 1/2 hole of the buff, put the punch so that it slides on top of the 3/4 OD of the adapter and hammer away. I also recommend to have the punch squared to buff as you do that. I use a machinist Vee block.
Brilliant ! Of course, you can as eazily turn adapters of different size (1/2 -> 5/8, 5/8 -> 3/4 etc)