The 'three inch rule' for scallop peaks - O'Brien

[Herman]

You lazy Bagwill! Give me a moment.

[Herman]

Here I drew the position of the upper tonebar, according to what Arnold wrote.
(Explanation for lazy Dave: It is the black line, you have to look for)

[Dave Bagwill]

I would thank you, but I'm too d**n lazy....

[Herman]

No one an opinion about this early tonebar position?
Seems to me it weakens the lower bout. Less resistence to raising behind the bridge.

[ken cierp]

The "X" intersection on those older Martins was much closer to the sound hole -- about an Inch.

[ken cierp]

I am not sure of John's exact measurements for that specific year and model but you can look here and see that the tone bar angles on the pre-wars were different than the modern "D" --- Don't forget that the reason Martin changed the design was indeed to reduce failure incidence -- not to improve sound quality.

http://www.cncguitarproducts.com/templa ... encil.html

[Herman]

Sorry Dave, a bit off topic, but:
Did they change those things also in OO models?
I ask, because my new "customer" wants a foreward shifted X on his OO 12 fretter.
Herman