THE GOOD/BAD NEWS
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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 bushing.

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.

SPEEDPILOT WINDOWS

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.

[excar]

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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