Checkout the Projects and articles section:
HERE
for example this one from Iceman, similar to what Brian described.
http://www.iceinspace.com.au/63-116-0-0-1-0.html
On a SW 10" Collapsible DOB previously owned, I went for the Bunnings lazy susan solution -
HERE
but found it too good (read blowing in the wind) and had to apply "brakes" which worked well in the end.
Happy modding.