While I was experimenting with motors i used 3,5mm corally connectors wrapped with heat shrink. (Make the connection, then completely cover the connector, it holds the joint more firmly too)
Then to change the motor you just need to slit the heart shrink, and use some fresh stuff.
I got some fairly short 3,5s the 4s all seemed to be very long and took up too much space.
I've got the motor selection sorted now, so they are permanently soldered into place. Only need to change in the event of mishap, or moving indoors. A 5.5t is a bit much for a 12m indoor straight!
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