Some time ago my viva sten stopped cycling properly, and then not at all. I took it apart and connected the battery to the motor unit directly to test it and it seemed to work...at first. On the second pull the motor did not stop for several seconds despite pulling the trigger several times, and it eventually responded by turning off. Basically sometimes it activates and sometimes it does not when pulling the trigger.
The battery is charged, and as far as I can tell none of the wires or connections are corroded or damaged. It seems to be the trigger button does not activate when pulled. Here is a review from another site with the trigger and motor mount pictured at number 4 of disassembley.
http://lrrphk.proboards.com/index.cg...lay&thread=239
Any suggestions (keeping in mind I know very little about this)?