I was able to obtain a nice old style Cox off Ebay, but it didn't include the plug wrench.  I know that all the Coxes included wrenches, so somebody with several old 15's might have a wrench to spare.  Hopefully,,,

Thank you.  I'll keep that in mind.

FWIW, I must have one around, because I still have a matching motor. (So still, in theory, need it )

Did you get a Medallion, or a Tee Dee?  I have a Tee Dee in all the sizes, except for the .15.
Lots of different models of the Tee Dee .15, and all of them rare and expensive it seems.

Thanks for the advice.  I went ahead and bought one from Canada. 
I forgot that the currency exchange goes our way so the wrench didn't cost much.  But the other unneeded items I ordered did.

You know, it's just plain inefficient to ship an international package with just one item.  I've been thinking about getting some of their product to evaluate their quality.

I was finally able to buy an Olympic .15, which was my first engine bigger than an .049.  At age 14 I didn't treat it well enough.  I damaged it and sent it back to Cox.  They wanted to charge me more than half the price of a new engine so I abandoned it and upgraded to a Fox Rocket.  Admittedly, the damage was my fault, but I made a management decision to spend my limited funds on a new 35 in lieu of a rebuilt 15.

There was a big guy in the club who changed HOT Cox heads with his thumb & finger.  Not me.