When be bought olivone she had all of the original technical stuff, basically nothing had been swapped out (everything was working but really old). There where even some strange old GPS-system (Philips branded) that just could show coordinates. We still have the old casette tape player mounted (will be taken out of commision as soon as i find something nice to cover the hole with). One of the things that we refitted was the old autohelm auto.pilot system. We choosed a new Raymarine system and the only reason for that was that they still use the same linear drive unit and by that we could use the old unit as a spare part (took 5 minutes to swap it). On the really old drive units Autohelm was using a plastic gearbox that could be worn down (there are replacement kits with steel gears availeable). SO i decided to take the ols drive apart to check the status of the gearbox and this is the results of that. Even if the gearbox was made of platics it looked to be in good condition so i just cleaned it from a little bit of dust and assembled it again.