Here are some pictures of my work in progress Parallelogram.
I've chosen some mahogany for the 4 main parallel arms for strength , the centre vertical post is temporary an only serves to hold the mount in a vice, as is the swinging arm at the end of the mount which will hold the binoculars.
When some decent hardwood is sourced i will remake these parts.
As you can see the movement is perfectly parallel when raised.
The total length of the mount from counter weight end to the other is about 1 metre.
The swinging arm add's another 6 or 7 inches.
Note also that all the bolts are just DIY store cheapo's, ill try to get some nice chromed ones for the finished mount.