Hi Gaz,
to IIS,
I too think that the lamp stand is too weak to deal with the large binoculars.
You can purchase a new parallelogram mount, or build one. There is a couple of DIY projects on this in the "Projects and Articles". This one is made of metal. The link below takes you to it that Allan mentioned:
http://www.iceinspace.com.au/63-376-0-0-1-0.html
There are others made of timber. This one is really heavy duty for a massive pair of binos, but you can adapt it, using the above one to give you ideas:
http://www.iceinspace.com.au/63-383-0-0-1-0.html
Mental.