wire gauges

[Vizzin72]

noted ... this would be a good time for me to do it.  so what ? put an insulated joint in and then a SPST on a wire to one of the rails?

[jbrock27]

Yes, but specifically to the same rail you put the insulated joiner on (or you can cut a gap, CA glue a piece of styrene in the gap and trim once dried, but the insulated joiner is easier to work with).  Also be sure you connect the wire coming off the SPST switch to bring power to the rail, to the correct side of where you have placed the insulated rail joiner/cut the gap.

[Vizzin72]

nice ! thanks I will definitely do this!