Thanks for that info GeorgeWest- although it doesn't sound too encouraging.  Less than 6 years - seems sad given the cost.  Hopefully Triton responds to the message.  Frustrating not to have a phone number to call.

Splintergroup- yep, both sides were about the same (other was a challenge as it was to the back of my setup so had to use my phone as a mirror to see!!)

I have to switch it off to raise to change bits (safety feature) so the switch does get into an on/off sequence regularly.