Wanted-v-brake cable guide to fit kona seatube

[stevext]

Hi All

I'm looking for a cable guide to fit the seatube on my '93 cindercone so i can use v-brakes.The one my mate used to use was a simple stainless steel item that attached like a seatclamp to the tube.I've tried stw and got a couple of ideas but wondered if anyones already done this to an older kona(plenty i expect).
cheers
stevext :?

 

[cce]

these were designed for cantis, but can be drilled out to take a housing for V's

i have one, but it's going back on the bike next time it gets a going over