Hi Dave,

Too Late But really, It's no problem Dave, It comes apart easy. I went back to the hardware store to take photos of the bits I bought as well. The tube I used, (I'm afraid this is all in millimeters ) was 40mm light duty. There is also a 40mm high pressure version but the walls are thicker and I couldn't find any fittings to fit inside snugly that I could modify to support the ball castor, either too big or too small. I ended up using a couple of 25mm caps that are designed for 25mm high pressure pipe (measured internally) They fitted quite tightly inside the 40mm LD pipe. I cut one of the caps right down to make a support for the ball castor, thinking about it now, I should have simply filled it something like Bondo and sanded it flat. Instead I pressed into the cap a bit of 25mm pipe and cut it off to make the walls thicker to give the castor more to sit on than just the cap walls. As you can see it it looks a bit crappy as I took to it with a Dremil tool to recess the castor a little to hold it in the center when the second cap is pressed over it to hold It in place. Anyhow, there's probably a million (better) ways to mount the castor in the end of the tube but this is how I did it.

I too was worried about the linear pot not working well with the sabertooth but it seems to work fine. Something I do need to test though is the linear actuator with some weight on top of it. I need to add about 5Kg to it, (my head section weighs about 5Kg), and test it with that. The actuator is apparently rated to 10Kg according to the specs, so I'm hoping it will do it with ease. Time will tell.

Steve