Gorby,
If you are new to Monties, like me ::), these might help you puzzle through what you have (or don't have ::) >:().
Here's a repair manual on Jared's site.
http://www.southwestmontesa.com/montesa/frmst1.htm
You might like to look through Jared's site to see what is and isn't available, especially comsumerables. You can also talk to Ross, he's restoring a H7 (I think) and also BigK, he's Monty knowledgeable and has some parts (I think).
Jared is the resident Monty Guru 8) and I'm sure he will help you 'scratch the itch' ;D if you have a q or two.
http://www.southwestmontesa.com/
In between, these parts book pages might help you puzzle through things. I've other pages in digital form so if you want I can email you with them. Let me know.
(http://i323.photobucket.com/albums/nn458/mx250syd/250vb15.jpg)
(http://i323.photobucket.com/albums/nn458/mx250syd/360h6-41.jpg)
(http://i323.photobucket.com/albums/nn458/mx250syd/360h6-40.jpg)
(http://i323.photobucket.com/albums/nn458/mx250syd/360h7-17.jpg)
The pages are a mix of VB250, H6 and H7 (titled) and the detail might vary but it'll give you something to work with.