Takes me back!
I never did rebuild as intended, with manitou internals etc..
I gave them to mini ninja rob, not sure what became of them.
The suspensionforks part thing is the way to go for that restoration feel but, still poxy elastomers at the end of the day.
I once rebuilt some manitou magnums using 'my own recipe' approach.
Therein was an approach to use 'an' elastomer for bottom and top out(probably robbed from something else) then i used RST springs for the main bouncy stuff. Some trial and error is needed but the outcome is generally good, and do-able in house, not spending large amounts of money or, waiting for the postman.
So long as you mimic the original stack height, reuse washers between the bounce media then, all should be good.
Nowt for the engineer minded individual.
Blather it all in rubber friendly grease.....http://www.ebay.co.uk/itm/Carlube-Silic ... 2a3fae53a4
See, i'm tight!
The goo....From memory i scraped manually what i could with the head of a long bolt, holding the threaded end. Then, used a wirey brush and hot water for the rest, sort of thing you would clean your car wheels with. That's as far as i got.
The manitou's i re- did were rebuilt as..bottom elastomer/spacer/spring/spacer/top elastomer. As the legs are fully up by hand, the whole stack wants to peep out of the top by, for example 20mm, so as you wind down the top cap it's all under load, thats pretty much it then. Now for the trial, see how they perform/rebound. It may need to be altered or swapped out with other bits to get what you want, and it's worth checking the crown cannot foul the front tyre.
Cheap RST forks can make good donor forks if internals are ok.
Ride yorkshire on an old bike.