I've got six clocks and only two of them work. The mechanical part of the clock seems to be OK but the electronic part seems to bugger up on them, it is a very small PC board with capacitors, resistors and diods on it. I have swapped one from a working clock to a non-working clock but it didn't fix the problem...

I am currently trying to get a PC board rebuilt and see if this makes any difference. Using the workings from a VB Commodore clock is a good option but as said the adjustment knob is in a different position and the ticking will drive you crazy if you are ever sleeping in the van when camping... My old van had the VB Commodore clock workings in it and I ended up fitting a on-off switch to it which I mounted under the dash.