How 'repairable' is the 300Tdi starter motor? I've looked in the manual I have and it only tells you how to fit and remove it.
I suspect that a build up of crud may be affecting the solenoid as sometimes it's a bit reluctant to turn over. In the past I stripped, cleaned and reassembled the starter on my Niva and it was like having a new starter, so i'm hoping that I can do the same for the 110.
I'm going to check all the leads too, earth, etc in case the problem isn't with the motor.