John,
I checked what I had here for SBT forend parts.
I have a total of 5 set forend wood in the parts drawers. ONE of those have the 3/8" diameter hole for the draw bolt head (which is also the standard size for the doubles). the other 4 are 11/16" diameter.
I have 3 SBT draw bolts. And those all have 11/16" heads on them. The length of the bolts measured from the shoulder is 5-3/4" on all of them.
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B. Dudley
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