as well I found it at Busy Bee for a hell of a lot cheaper than anywhere else...

take a look

Busy Bee Tools Item Detail

 

no problem

 

many plunge router's also have the ability to add an attachment that has an adjustable pin that is designed for making circles of any sizes
for ex: makita
check with the manufacturer of your specific router

 

Never used a circle jig and I've cut hundreds of holes,

for subs and speaker pods, many with paint or other coverings.

I use a jig saw, and if you have a good jig saw with variable speeds and the right blade, and of course a steady hand, you can make just as good, faster holes than set up a router with circle guide.

You can get upward and downward facing blades.

Now, if you're not good with a jig saw, then go with the router and guide.

 

^ I used to say the same thing, and then I got this same Jasper jig as a gift and truly a jigsaw does not compare. When consistency and concentricity count, you need a router and a jig - whether one of these or a simple teardrop style.

 

I don't know about everyone else, but I always seem to have lots of pieces of mdf kicking around. I just took a piece of mdf 6-8 inches wide x 14 inches long, drilled a big hole for the bit to fit through and mounted the plunge router to the mdf. Then just measure from the outside of the bit to the length of the radius you need for your circle and drill a long screw through the mdf and into the centre of the hole you're going to cut. Make one pass halfway through your material, lower your bit and make the final pass all the way through, slowing down just as you are almost through on your second pass. Voila, perfect dusty hole. Price: already paid for it. Replacement price: already paid that too. Now don't me wrong, I'd love a fancy jig too.

 

I absolutely agree. A simple jig like that is all one needs and you can either make it yourself or buy one for about $20. I sometimes just use my table mounted router and drill a hole right in the table top (it's replaceable) to spin the wood on rather than the router on the wood.

The Jasper is just handy in that it is pre-marked in 1/16" increments.