I don't know if this is doable, but I'm going to check with Windwave tomorrow. in the mean time, if you know either way, do let me know.

I want to change my 105mm travel 2003 ETAs to 120mm. The '03 and '04 forks seem similar externally, with the exception of a beefier (hurrah!) ETA lever on the '04s.

Internally, I have no idea, as they're not my old Psylos, so I don't need to strip and service them every 30 odd hours of riding (They're very old Psylos, in case you thought I was being excessively anal about servicing - the MXCs on my hardtail have not been taken to bits in about 2 years because they still work perfectly - one reason I went for Marzocchis again)

Internally, I have no idea about the MX Pros, although I assume there is some sort of damping cartridge involved. However, I assume it's possible to put in a new spring, and possibly necessary to get an '04 cartridge with a longer shaft.

As I said, I have no idea if this is possible (or cheap, for that matter) but if anyone knows these forks, do let me know.

ya Marz USA said you need longer or shorter eta carts depending which way you go up or down. Wonder if you could get away with 120mm cart down to 105mm ok.

Thanks - I checked with Windwave yesterday about increasing the travel on '03 MXCs, and their tech bloke said that the '04 forks - which are 120mm - have longer stanchions and lowers to get that sort of travel.
So whilst I could reduce the travel on my '03 forks to 85mm, I can't increase it to 120mm.
Which is not a world ending type thing for me, as I love them very much just as they are...

yep I forgot about that