Decided to take the advice of the forum and ditch the (frankly dangerous) cantilevers on the CX bike in move to mini Vs, which were kindly provided by Northwind of this parish.
I have however stumbled across a fundamental flaw in the fork design when fitting them...fork is this dolan fork
Basically the 'bulgy bit' on the fork by the cantilever stud catches on the back of the vbrake when you've tightened it up fully. The obvious solution was to put in a couple of mm of spacers to move the vbrake away from the fork, but it was pointed out that this means that i'd need to lenghten the stud as well, which I can't do.
So basically I'm left with a bike that will only take the worst type of brake available to man....
new fork time Or ingenious fudge?