One last bump up here,these chairs are still avaliable and have been tested to 110KG,
I used mine all last night at the scope and they make visual so much more pleasurable.
I'll give these another week here,then off to art supply shops-as I sold one to an artist for painting work-she can adjust height so she paint varying heights pictures.
I do hope I can sell these in astronomy community,although artists are seeming to have longer arms and shallower pockets than astronomers
If you would like to buy PM me or better still phone Geoff on the below phone number-He has them in Brisbane to send or pick up from Brisbane.
Chris