RE: The Unofficial all things Jet drive thread
Those magnetic couplers are fascinating. [link=http://www.fscoupling.com/4mm-to-5mm-helical-set-screw-flexible-beam-coupling-4x5mm-motor-flexible-coupler-diameter-20mm-length-25mm-p-217.html]Here [/link] is another source for couplers. I used a short piece of flex and two collets to make a coupler in one boat. But I don't see why you couldn't use a teflon lined stuffing tube and put the motor further forward. You would just need to support it.