TRIP and TWINMASTERS
Be careful with the bottom right hand knobs on Twins, the one that
selects one or both readouts. The shafts break easily on contact with a
navigator's knee or gorilla's fingers and I have very few spares left. The
drive cable into Masters can turn either way, just turn the +o- knob to suit.
I have sets of new transfers for the lettering so I can do quite a good job
on restoring the cases. When re-fitting the calibration gears on the frame,
make sure they are in mesh and the big wheel has not been pushed askew on
its central hub. PLEASE don't fill them with oil, a dab of grease on the
spindles is all they need.
LOOSE RATTLING BITS
The round bushing at the rear of Trips and Twins which accepts the
drive cable sometimes comes loose. Easily rectified! Remove the side panel
and you will see a flat brass clip with two prongs and a small rectangle
bent up. Remove this (on plastic models you will have to remove the carrier
locating spring - 2 small screws - first) and use pliers to bend down the
prongs a little so that they will engage tightly in the groove in the
IT CLICKS INSTEAD OF GOING ROUND
A fault mostly found in the plastic case models is that when one register
reaches 9 it fails to turn to 0 and just jams up making a clicking noise.
Sometimes this is due to the zero knob not having been pulled out fully but
mostly it is due to a fault which only I have been able to trace. I know
a cure which works, this involves drilling and tapping the back plate.
THE BAD NEWS
HALDEX AB were taken over by Trancometer in the 80's and have not made
any mechanical instruments since the 70's, or any of the electronic Halda
Rally computers since 1993. The tooling has been scrapped long ago but a
lot of the spares have ended up with me. I am having some of the more commonly
used parts re-manufactured; calibration wheels, cables, T-gears and some
of the small cogs and shafts.
So it is no good ringing up Halda any more unless you want a taxi meter.
After making do with some cheapo flat perspex replacements I have now
had some proper dished windows made, these are exactly as the originals except
they lack the raised bosses appearing on some models. This makes no difference
to the operation or fitting. The special process involved in dishing the
perspex yet maintaining optical quality means the price has to be
each. I prefer to fit them myself as I have a special drill bit to get the
holes perfectly round and in the right place. I will fit them for free.
THE EXPERTS CHOICE?
So many people asked Martin what the ideal combination of instruments is,
and he stuck his neck out and pointed to a Twinmaster, a Speedpilot
MK.V and a circular average speed calculator as the ultimate for navigational
events. For stage events a Twin or Tripmaster is all you will need. You CAN
do a Classic Marathon on just a Tripmaster but you need to be practised at
working out average speeds. And . . . did you realise that if you connect
a Speedpilot to your rev-counter cable you can complete the Marathon without
leaving the start?
And finally . . . it was an American, not an Irish, navigator, who asked
me for a 26 1/2 tooth cog so that he could get his Halda EXACTLY right...
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