its easy
let all the air out the chamber(make sure u compress the forks to remove all pressure)
remove valve top cap,
remove lower allen bolts on bottom of each leg,
mistake i made(make sure u have somthing to catch the oil in lower left leg,
pop a philips screwdriver into left lower leg and tap ligtley till the internals come loose at this point the oil will come out.
pop the internal out the top of the fork leg and you will see spacers cliped onto the shaft when removed these will increse travel

just reverse to rebuild shouldent take more than about 45 mins first time i got my servecing down to about 30 mins

i put new oil in when i did mine might aswell while its out
its up to u end of the day i would pop them open and see if u can change it if not pop them back together properley and sell them on atleast u can then be honest if anyone asks if they can be adjusted oh and its a hell of allot easyer with forks off the bike.

Mine came on a bike and I extended them. Almost all are extendable.