Yep, those are awesome.  I made my own for at home out of 1/2" Plexi.

^CLICK ME TO SEE HOW I BUILT EVERYTHING^ How To in Interior Forum
 
 
Damn, I'm still using a compass and jigsaw...
wysiwyg wrote:i would say they bang, they don't really pound so much. but if
 you want to bump, then they will bump and hit real hard and a lot good. 
LOL
 
 
For outside cut of circle rings measure from the inside of the bit, and for inside cut of circle measure from the outside of bit.  That's where I kept making mistakes and actually engraved it into my jig so I don't forget each time I use it.  I think that may be the problem.

^CLICK ME TO SEE HOW I BUILT EVERYTHING^ How To in Interior Forum
 
 
Mennitti wrote:For outside cut of circle rings measure from the inside of the bit, and for inside cut of circle measure from the outside of bit.  That's where I kept making mistakes and actually engraved it into my jig so I don't forget each time I use it.  I think that may be the problem.
nah the inside will be fine the Jasper is setup for measurements of the hole itself  so the hole i cut is 13.5 inches in diameter but my piece of wood that was cut out is 13 inches   so whenever cutting rings I need to make my system .5 inches bigger than needed
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good deal Geeds, cuz im in need of some rings 
ps - love the FTMFW, lol!!!!!!
 
 
damn you ive been looking everywhere for that thing!! where did you find it? all the online places ive looked its sold out..phil