This is where I get all confused with this hub lingo...
Let me lay it out straight, as I would really like to buy the tensioner off of this guy if it'll fit my sweet gold hub:
The allen head bolts that are used to tighten the hub to the frame are 10mm in diameter and not hollow.
The axle itself (that rides on the hub bearings) is 15mm in diameter (and is hollow to accommodate the allen head bolt). In this case the tensioner I need has an ID of 15mm with the key to fit into my vertical dropout, if it exists.
Soooo, Monkey, if the tensioner in you garage has an inner diameter of 15mm, I'll buy it off of you (depending on the price of shipping to get that little thing over the pond).
(pm me if so, so we don't turn this into a FS thread... )