I know this has been done to death but I just checked my cam chain tensioner. Bike has about 20k on it. Here's what I found,

Right around 18mm. I had a modified tensioner from verslagen so I installed it. Now I'm off to the store to buy some oil. The whole job took me about 1 hour 45 minutes. Having a garage to work in really helps.
Verslagen, where do you want me to send the old one? PM or email me the address.
Oh, by the way, I'm all settled in my new place and life is good for a while. Except now I have to mow the lawn and stuff like that which I never had to do before.
AL