Thanks for the link, I've been looking for one of these for a long time.
Kinda pricey though.
I've tried using a standard hole saw and don't recommend it.
The teeth tend to be staggered (in and out) and they will make your hole just slightly larger than it should be. Record will shift around on the spindle and sound drunk.
We took a hole saw to my machinist buddy and he trimmed down the outer edge of the teeth so now it cuts at the proper size. All I have to do is clean up the hole with sand paper and it looks very clean and dare I say almost professional.
Still you have to be very careful to center everything exactly, I use a jig I made with the router to hold record and a pre-drilled center hole. Also do not push too hard because if the saw binds and spins your record it's get scuffed up or worse, crack.