You could try renting a better drill from your local hardware store?

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This is the only correct answer

They rent out diamond core drills? Lol. Guess it’s worth a check

This is one of those problems in life that is cheaper to just buy new* drilling granite is hard to do, it's going to be even harder to stay on Center with the existing hole.

There's no cheap way to do what you're talking about. Just buy the weights, unless you really really really want granite weights. Counter stores that deals in granite might be able to help you, but keep in mind if you drop them they're going to break.

Maybe not at a hardware store, but certainly at a construction equipment rental business.

Something like Battlefield: https://www.battlefieldequipment.ca/

You will may have to purchase the diamond core bit in addition to the drill rental fee.

Even some Home Depot stores have smaller diameters

Yes, home depot will rent you a Hilti core drill no questions asked. Used it on a curb once.... dont tell the city lol

Maybe just get a 1" bar for those?

He could fill the existing 1” hole with a 1” diameter wooden rod, and tighten the fit with shims.

Get/make an appropriately sized mold, shatter the granite, and use it as ballast in a new concrete pour for a plate.

That's a great idea!!, Then he just use any standard diamond hole saw with the center drill bit.

.... It's still going to cost him $100 for the hole saw but he's not asking for something that's cheap* Tools are expensive.!

They are called core drills…and it’s what you need. A water hose hooks to them to lubricate and dissipate heat, and they usually need a generator to plug into, as they are 220. But, they will make short work of this.

It’s what is is used to put entrance holes in foundations and stem walls.

Should be like 80 bucks to rent one for 1/2 a day.

Usually the rentals will come with 2 bits with the size of your choosing, and as long as you don’t totally toast them, they are included in the price of the drill…

Thanks.

The cheap way? take some sandpaper to the inner ring to rough it up and increase surface area. Take a rag soaked in water, preferably without a neutral PH and rub it around the inner hole for about 5 minutes, resoaking the rag every minute or so. This will help dissolve the feldspars in the granite. Immediately after while still wet, stick it in the freezer for an hour. Pull it out and let it come to room temp. The water will have soaked into the areas of dissolved feldspars, frozen, expanded, and chipped out undissolved material. Repeat this process about 50 to 100 thousand times, and you will probably get close to the 2" diameter.

Or get a stone router bit like these and work the inner circle until its the desired diameter.

pro tip…drill a 2” hole in a piece of plywood ,center it up and blue tape it down. stand on it to hold it in place as you drill. hold the drill up an 1/8 or so and let it get up to speed,then ease it down gently. alternatively, make up some bar extensions to slide over your existing bar.

Buy a 2" hole saw from big orange or similar.

https://www.homedepot.com/p/Milwaukee-2-in-Diamond-Max-Hole-Saw-49-56-5645/204994417

Would go even better if you have access to a drill press and some clamps... Alternatively find one with a pilot bit and clamp the granite to a chunk of wood.

Granite is hard, I'd probably use a spray bottle to keep things wet.

You just hole saw out a piece of plywood the same size as your diamond hole saw and then clamp it to the granite.

Rent a diamond saw or phone in a water jet cutting places and ask for pricing and go from there.

I was sitting here wondering, maybe he is thinking about this the wrong way.

Can't you get a smaller bar to fit the holes?

Otherwise, I would drill a 2" hole in a piece of wood and then clamp that in place as securely as possible over the work piece. The hole in the wood will be the guide for the hole saw.

You might need to check out an equipment rental place to get an adequate hole saw. If you can do the job in a few hours, you may be able to just rent a saw for half a day. My local place will rent to you for a half day if you get it back quick enough.

Clamp another piece of granite or wood to the piece with the hole and start the new hole in the new scrap piece. Follow it all the way through the piece with the existing hole. Granite isn’t my thing but I’ve done this with hole saws plenty of times.

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Granite would crack too easily if you dropped the bar.

You’re going to break one re-racking it, all the weight’s going to shift to the other side, then you’ll have broken granite exploding at you- unless you fall, in which case the second granite plate will split as you hit the ground and cut you the fuck up. This is possibly one of the worst ideas I’ve ever heard

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