Replace GrandTune with Waverly

AeroUSA · #1 02-13-2019, 09:59 PM

I’ve had so many bad GrandTune tuners. I want to replace my. Irrent set with Waverly. Stew Mac told me the spacing is the same but they will be smaller than the existing bushings. I don’t suppose that matters.

Has anyone done this before?

Brucebubs · #2 02-13-2019, 10:34 PM

I just happened to read about this on another forum.

The trouble with this swap is that you need to use Waverly push-fit bushings with Waverly tuners and Schaller bushings with Schaller tuners because the tuner string shafts are different sizes.

The Schaller Grand Tune shaft is 6.0mm - so the bushing has a 6.0mm and is made to fit a 8.8mm hole in the headstock.

The Waverly tuner shaft is 6.32mm - so the bushing has a 6.32mm hole and is made to fit a smaller 8.64mm hole in the headstock.

So you can't just leave in the existing Schaller tuner bushings because the Waverly shaft is too big and you can't just swap to the Waverly bushings because the hole in the headstock is too big!

AeroUSA · #3 02-13-2019, 10:41 PM

Quote:

Originally Posted by Brucebubs

I just happened to read about this on another forum.

The trouble with this swap is that you need to use Waverly push-fit bushings with Waverly tuners and Schaller bushings with Schaller tuners because the tuner string shafts are different sizes.

The Schaller Grand Tune shaft is 6.0mm - so the bushing has a 6.0mm and is made to fit a 8.88mm hole in the headstock.

The Waverly tuner shaft is 6.32mm - so the bushing has a 6.32mm hole and is made to fit a smaller 8.64mm hole in the headstock.

So you can't leave the existing Schaller tuner bushings because the Waverly shaft is too big and you can't just swap to the Waverly bushings because the hole in the headstock is too big!

That sucks. So I cannot do it?

Brucebubs · #4 02-13-2019, 10:47 PM

Quote:

Originally Posted by AeroUSA

That sucks. So I cannot do it?

The only way to do it is to have the holes in the headstock professionally filled and re drilled with smaller holes to take the Waverly bushings.

AeroUSA · #5 02-13-2019, 10:50 PM

Oh man that sucks. I guess I’ll have to keep trying GrandTunes until I get some that are usable. They really are terrible.

AeroUSA · #6 02-13-2019, 10:51 PM

Wait. Why can’t I leave the existing bushing and just put the Waverly in there. It will fit but there will be a gap but it won’t matter as the screws will secure it in place.

Brucebubs · #7 02-13-2019, 10:56 PM

Quote:

Originally Posted by AeroUSA

Wait. Why can’t I leave the existing bushing and just put the Waverly in there. It will fit bit there will be a gap but it won’t matter as the screws will secure it in place.

Because the string shaft of the Waverly tuner is too fat to go through the hole in the Grand Tune bushing.

Grand Tune bushing hole 6.0mm - Waverly shaft 6.32mm

Monsoon1 · #8 02-13-2019, 11:22 PM

Quote:

Originally Posted by Brucebubs

I just happened to read about this on another forum.

The trouble with this swap is that you need to use Waverly push-fit bushings with Waverly tuners and Schaller bushings with Schaller tuners because the tuner string shafts are different sizes.

The Schaller Grand Tune shaft is 6.0mm - so the bushing has a 6.0mm and is made to fit a 8.8mm hole in the headstock.

The Waverly tuner shaft is 6.32mm - so the bushing has a 6.32mm hole and is made to fit a smaller 8.64mm hole in the headstock.

So you can't just leave in the existing Schaller tuner bushings because the Waverly shaft is too big and you can't just swap to the Waverly bushings because the hole in the headstock is too big!

fwiw that is only a difference of .006" in headstock hole size.

Brucebubs · #9 02-13-2019, 11:30 PM

Quote:

Originally Posted by Monsoon1

fwiw that is only a difference of .006" in headstock hole size.

Yes that would be fine if you were swapping Waverly to Schallers but the other way round is a problem if the hole is too big.

Monsoon1 · #10 02-13-2019, 11:34 PM

Quote:

Originally Posted by AeroUSA

Oh man that sucks. I guess I’ll have to keep trying GrandTunes until I get some that are usable. They really are terrible.

You could get a cheap set of feeler gauges like this set, and take the .003" gauge and cut a piece to shim up the hole size. It will cut very easily, and you would have enough for all 6 tuners.
https://www.amazon.com/32-Piece-Stai...85975923&psc=1

Monsoon1 · #11 02-13-2019, 11:36 PM

Quote:

Originally Posted by Brucebubs

Yes that would be fine if you were swapping Waverly to Schallers but the other way round is a problem if the hole is too big.

He is specifically talking about going to the Waverly tuners.
So the hole will be bigger than necessary, but a simple shim fixes that.

Monsoon1 · #12 02-13-2019, 11:41 PM

Also, the most common hole size tolerance is +/- .005"
So it's possible it wouldn't need a shim at all. But even if it does, it's trivial to cut shims out of feeler gauges.

AeroUSA · #13 02-13-2019, 11:46 PM

Quote:

Originally Posted by Monsoon1

Also, the most common hole size tolerance is +/- .005"
So it's possible it wouldn't need a shim at all. But even if it does, it's trivial to cut shims out of feeler gauges.

Are you saying there is a chance they will fit?

Monsoon1 · #14 02-13-2019, 11:51 PM

Quote:

Originally Posted by AeroUSA

Are you saying there is a chance they will fit?

It 100% will. You're going from a larger hole spec with the grand tune set to the Waverly set which requires a smaller hole... but only by 6 thousandths of an inch. You could possibly get lucky and not need shims. But even if you do it's a very simple and cheap fix.

AeroUSA · #15 02-13-2019, 11:57 PM

Quote:

Originally Posted by Monsoon1

It 100% will. You're going from a larger hole spec with the grand tune set to the Waverly set which requires a smaller hole... but only by 6 thousandths of an inch. You could possibly get lucky and not need shims. But even if you do it's a very simple and cheap fix.

Why do you need shims? Is it a problem if there is a slight gap?