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.