Thanks for the advice and offers. Alas not a Cherub in Torbay. I just use your site for build info (if I may). I'm putting an asymmetric on something else and it's actually the pole tube I have to make. The pole I will use is the top section of an RS600 mast and the kite will be 8 or 10 sq m., so not massive like the Cherubs' so I hope it will hold.
The only Cherub I have ever heard about in Torbay was an Ellway1 years ago sailing from Torquay, long before I lived here. I did have a look at your boats last year in Babbacombe though, very impressive!