I purchased one of these
http://www.officeworks.com.au/retail...irs/OWZODBARBK last Saturday and really like it so far. Using a C8 SCT pier mounted with rotary multiple eyepiece holder I had a comfortable non wobbly viewing session for the first time.
If I needed to increase the maximum height it would be very easy to just insert a block of wood of the appropriate thickness between the seat and the stand. Longer screws would be all that would be needed.
Michael