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Need more details mate!! Some like BC can be adjusted simply by loosening the lock nut, removing the hub bolts and turning the bottom of the strut cos the body is threaded
Not the greatest of pics but looks the same basic set up as my BC's. looks like the lock ring is a bit rusty tho. Undo this first then the 2 19mm hub mounting bolts then you should be able to screw the bottom part of the strut up/down to adjust the ride height
You ll need some form of C spanner to unlock the locking nut if that's what's required I can't really see it cos it looks quite rusty, and 19mm socket and spanner for the hub bolts
Actually mate on closer inspection I think I'm wrong! It looks like the thread is purely there for the locking nut to adjust the compression on the spring and not for adjusting the ride height. If you have anymore pics it might help