I've got a device (a PocketWizard Plus X for you photographers out there) powered by 2x AA batteries that needs a shim of some kind behind the circuit board in order for it to work properly.
I used paper. Is that safe? Or will it start a fire? It's touching the backs of lots of the board components.
The shim is necessary because the device has a rotary switch that changes between 10 channels, and something in the switch has play, which in turn, causes the device to work only sporadically - as if it's stuck between the channels. The shim as installed solves the problem completely and it works as new.
If not paper - is there another material you might recommend?
This will be used exclusively indoors, and it's ideal if the batteries can be left in it.