I haven't done it yet as all the parts are on order.
I'm going to put together these items to heat the secondary mirror, finder scope, eyepiece, and maybe the eyepiece holder if I can get it to adapt on there somehow.
My plan is to use these items:
The Dimmer switch from eBay:
http://www.ebay.com.au/itm/LED-Light...00951172146%26
$3.78 each x 2 for two controllers. I will split each controller to do two heaters.
The Heaters from eBay:
http://www.ebay.com.au/itm/New-Warm-...47f89bb&_uhb=1
$4 x 2. Two pairs I'm ordering. Motorcycle grip heater pads. They come as a pair and they're flexible. I will encase these in a material pocket with velcro.
12v Accessory plug:
http://www.ebay.com.au/itm/Accessory...a44ce3b&_uhb=1
$10. We all know what this is for.
I also purchased 10m of twin core wire to make my cables and connecting leads out of for everything. $16
And a $30 Jaycar purchase for all the RCA connectors and RCA splitters to connect everything with.
So all up $72 roughly so far. If I can get this to work, it'll be a whack cheaper than purchasing the real things for quadruple this.
Let me know what you think...