However, when i got it back i realised the reservoir was facing the wrong way, so i tried undoing the pinch bolt as little as possible to swivel it and a load of the gas/ oil or whatever squirted out

Now when fitted to the bike, it is really spongy and drops way too far when i sit on the bike, would this be purely because i have lost too much gas out of the reservoir?
And does anybody know of anywhere in the North East that can re gas it? I'm trying to find somewhere around newcastle area as i don't want to have to send it off again just for a re gas.
Any help would be much appreciated.
Cheers, Richie