Re: 24.75" Iceman IC300 neck on Jem Jr. body?!?
If they had the same number of frets, then you'd have to move the bridge by
(648 - 629) / 4 = 19 / 4 = 4.75mm TOWARD the neck (648 = 25.5 and 629 = 24.75).
As there are a couple of frets missing, the neck is moved towards the bridge by 2 frets, for 24.75 inch scale this is about 19.25 mm.
This means the bridge needs to be moved AWAY from the neck by about 14.5mm!
This assumes the same length of fretboard after the last fret.
You could leave the bridge where it is (!) and add 14.5mm to the neck as an extension so the neck doesn't go as far in to the neck pocket!!
NB: please don't take these calculations as read as you'd need to check them before trying, they're just estimates for illustration purposes....
Last edited by Vim Fuego; 08-19-2009 at 09:14 AM.