S100 73 bridge curve

[Storgio]

Hi
I have a 74 M75CS and a 73 S90 and they both look to be about 12 at a very quick look. The S90 is in very poor condition needing lots of restoration so I cannot claim how accurate it is. It is missing bits.

I’ve attached a picture of the M75 for reference.

Did you luthier actually put a gauge on them and get a measure of the bridge and fretboard?

The strange thing is that the bridge on my m75 is settled way more higher than your bit the action is really low… I got the opposite situation on the s100 so probably the production was not so consistent during 70s

 

[lungimsam]

So on the S-100 they made a bridge that doesn’t match fretboard radius and without the ability to adjust the individual strings to the neck radius?

 

[Storgio]

So on the S-100 they made a bridge that doesn’t match fretboard radius and without the ability to adjust the individual strings to the neck radius?

Looks like you are right… maybe the bridge I have right now is not the original one. Anyway the one from the m-75 doesn’t match the radius neither, is much better but not perfect

 

[Storgio]

Finally I got the solution (at least for me): I switched the more flat bridge on the S100 and the more arched one on the M75 and so then both are matching better the neck radius.
I checked both guitars with luthier and he said it was perfect and now is setting the nut on the S100.
I might do some small adjustments on rollers but right now everything is working fine.
I don’t know if the bridge on the S100 was original or not… another adjustment have been done is cutting the bridge height screws because they were getting too high compared to the bridge position .

Thanks for you help guys