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Both legs have nut covers underneath them.
Ah, they have 03 written on them and "Marathon S"
http://my-sport.spb.ru/manual_1/2003%20bomber.pdf
Marathon S
Right leg - HSCV cartridge
Left leg - ETA cartridgeFork bottoms too easily; needs more than maximum preload to attain proper sag
= Spring rate too soft or fork oil too low- Check oil height
- Get stiffer springs
- Increase air pressure
- Check oil height
hippy
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Ah right. I had the 2004 versions of these. Cheapest & easiest is to change the oil & get the right amount in there. It's also possible that a previous owner used a lighter oil than recommended.
On mine the only thing affected by air was the preload, which tended to make the fork lose any sensitivity to smaller bumps, and generally feel a bit rubbish, so I kept that air chamber empty.
Other than that, you could have a long search for a suitable spring.
Does the ETA still work?
BareNecessities
There was briefly a Marzocchi Marathon coil sprung fork, but all the other Marathons were air forks.
They'll have plenty of oil in them either way ( or should have ), as they were an open bath system.
Got a picture?