Here's some hole saw tech for you guys.

So there's a few on here, but I haven't seen this particular one yet to enlarge a hole that's in the right spot.
Here's what you need, a hole that needs to be bigger.
A hole saw that's the size of the current hole
A hole saw that's the size of the hole you want
A shock stud, same thread as the hole saws.

Thread the shock stud into the larger of the hole saws first, then thread the smaller one on, this is the pilot. Chuck it up in the drill of choice and have at it.
Works like a champ.

The plywood outer pilot trick wasnt cutting the mustard on this one.

 

Eazy

 

Peazy

 

A job well done sir! Thanks for posting

 

another way to do it is to cut a hole in a piece of scrap using the size hole you want your new hole to be, position that piecer over the hole you want to enlarge then drill.
the scrap piece will hold the position of your hole saw over your new hole. This is particulary useful if you new hole will not be concentric with the old hole.

 

Great idea, will remember it for future use. Another tip when using a hole saw on a hand drill, drill pilot hole and then replace the bit with some smooth bar stock the same diameter.

 

Now, how do you make a hole smaller than the one you just drilled in your dash?

 

Very good idea. Simple but effective. Thanks for sharing your trick.

 

Simple and obvious (once you see it) -- like all great ideas !

 

Nice idea, going to try this one!

 

WOW! So simple. Thanks.

 

Try the 'Acme' cataloge-Wiley Coyote had great success with their 'assorted holes' just pick out the size you need and stick it on-couldn't be easier.

 

Let me think about that one.

......... Smoke from ears ......

Trim ring trickery or Wylie's catalogue

 

Now you're just making the rest of us feel stupid.

Thanks for the tip.

.bjb

 

Awesome tip!

 

Idk about all that, now.
I enjoy the tech here, my little contribution on using tools how they weren't meant to be used

 

Or, you can buy an "Oops"
http://www.youtube.com/watch?v=iwvnsIYIOiw

 

Excellent tip. Thanks

 

Man that's no fun !!!
What if you can't afford to go that deep on the inner one?

 

Hey! That was useful. Thanks!

 

It'll slide in further than the video shows. The OG tip is a good one, but in over 50 years of tinkering and saving almost everything, I doubt that I have a shock mount stud in any of my coffee cans

 

Learn somethin new everyday! Thanks! Then there 's this scenario which I do quite often! Sometimes I RELEARN somethin new everyday!

 

Simple - just run the drill motor in reverse.....

 

Neato. Telling someone how is one thing but SHOWING them how is much better! peace

 

Those arbors are available to buy from Lee Valley Tools if you can't find a shock stud.

 

sooo I could sell you a shock stud at the same price and you'd be happy?

 

Appreciate the ingenuity. This may came in handy when installing a larger dash gauge/speedometer/lighter/headlamp switch/etc.

 

One thing to keep in mind is there's two different hole saw arbor sizes; one size up to 1.125" (maybe 1.25), then a larger one above that. So depending what size you have and what size you need, some monkey-motion may be needed....

 

Great. Now I have a reason to save worn out hole saws! Smooth trick there and thanks for turning us on to it!

 

Why didn't I think of that? Cool, thanks!