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Availability of HALDA Products HOW TO CHANGE YOUR GEAR WHEELS CIRCULAR AVERAGE SPEED CALCULATORS
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These things are an awful price but absolutely essential. Speedpilots have two T-gears in their drive-live but masters only have one. There are 8:1 and 7.5:1 reduction gears but the 7.5:1 gears are only fitted to the back of Speedpilots and an 8:1 will do. The only other type of T-gear is a 1:1 which is 'not' a reduction gear, dear boy, and is used to join two instruments or change direction of drive in a restricted space. The drive pin connecting the Speedpilot with the T-gear screwed to its back must be the correct length and turn 'CLOCKWISE' looking at the front of the unit. If it is turning the wrong way, the Speedpilot will move a bit and then make a buzzing noise. Take the T-gear behind the speedometer and swap over two opposite end fittings, by loosening the grub screws and pulling the fittings out. Turn the nylon gear or worm shaft round as well and don't lose the little thrust washers, one at each end. This will reverse the direction of rotation and will make the Speedpilot click away in fits and starts as it is supposed to. This is because it is driven by a system of pawls, ratchets and eccentrics (like historic rallying) and worries people who expect it to go round continuously like a Twinmaster. There are two thicknesses of inner cable, the thicker 3.2mm cable is used in most British cars with Smiths speedometers. Cutting the squared end is only to be attempted by the intrepid or the panic-stricken as the wire is liable to uncoil as the end is removed. It will NEVER lie flat again! Before you do anything drastic, consult HE WHO KNOWS, as there may be an alternative way of fitting the offending part. I also have the equipment for making new inner cables. An inner cable should never make contact with the closed end of its socket when fitted into its T-gear or instrument. The greater the radius of any bends in your drive cables, the longer they will last. 6" radius is the very minimum but a longer cable is advisable even if it shows. If it doesn't work, DON'T PANIC!!! It is far more likely that you have fitted it wrongly than that it has given up the ghost suddenly. Check the drive line methodically, unscrewing each union and testing until you find where the drive is interrupted. Then sit down and think like Winnie the Pooh. Surprisingly enough, this usually supplies the answer. If you get that 'Eeyore' feeling, email, ring or fax me but do try and make it a couple of weeks before the next event in case you need to send something in the post.
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