For anyone that was interested in the halfnut nut conversion I did previously, I have now added a carriage handwheel to move the carriage up and down the bed once the halfnut has been disengaged.
It works really well and is a bit more graceful that sliding the carriage by hand.
I very quickly put together a youtube video of the mod, here's a link
If anyone would like more details I do have a drawing with most of the measurements
Stu