[TenTec] Century 22 calibrator?

[Tim Cook]

Hi,
I found a pretty nice Century 22 at a hamfest this weekend. It seems to work great, made a few qsos with good reports so far. It has full power output and the pto is as smooth as any I've used including new ones. The downsides are I'll need to put some new elastic on the dial string and it doesn't have the calibrator. I've got a couple I might be able to install internally. A homebrew version of the calibrator ten tec made for the 509 argos that I made back in the late 70's and a modern day marker made by QRP guys. 

Just like to hear from anyone who might have installed an aftermarket calibrator in a C22 using the internal location and switch. It's not a huge issue, I set the pto dial on the low end of 40 to zero and it follows closely enough but I like to have the capability...

Thanks in advance for any information.

73
Tim
NZ8J