thanks button is your friend
give me a shout if you get stuck.
If the bolt is slightly loose either side, dont just tighten it up as it will come loose again and you will snap the bolt.
If there tight dont take the arb plate bolts out.
You might just get away with tightening the arb, if the bolts are loose, take them out, get some thread lock its about £2.50 from a motor shop. Also get another washer then put the bolts back in, you may have to lift one of the trailing arms to line the hole up.
Make sure you use the thread lock, while your at it, mayswel check to see if the arb is tight regardless.