"Zog The Undeniable" wrote in message
...
vernon wrote:
It's just about a year since I acquired a Trevor Jarvis Flying Gate
replica in fixie guise. I've had a couple of attempts at riding it and
have decided to reverse engineer the bike back into its geared
incarnation - I don't think that fixed wheel is for me.

One of the things that's puzzling me is that the mounts for the downtube
sufters appear to be just squares of metal with a hole in the middle and
the down tube blanks off the the bottom of the hole effectively making it
a blind hole. There is insuffient metal in the brazed on squares to
allow screw threading to take place. Does anyone have any idea what sort
of mechanism fitted onto these squares? Oh and another refinement is that
the derailleur cables have tubes let into the frame to allow internal
routing of the cables. Will this complicate matters?

I wonder if they were standard Campgnolo-pattern DT bosses which someone
has partially sawn off as part of the fixie conversion (does it look as if
a rear mech hanger has been sawn off too?). Internal routing of gear
cables isn't ideal for indexed systems, which like straight runs of bare
inner as much as possible, and was probably designed in the days of
frcition shift.

Thankfully the rear mech hanger is intact. It's a chromed Campagnolo set up
at the rear. I'm wondering if the fixings were a sort of band on
arrangement. I've prepared a few poorly focussed images to try to give a
better idea...

http://picasaweb.google.com/vernonlevy/Gate/

Another verbal attempt is that the mounts are best described as square pads
machined at their rears to accommodate the curvature of the downtube. There
doesn't appear to be any evidence of the blocks/pads being sawn down. The
bike was almost certainly a friction shift machine - I can live with that.

Could it bee that I need new braze ons? The frame needs a respray anyway.