Hi all first post hope someone can help. I have a worchester 24i just had a new gas valve fitted, problem is, I am having problems just turning the boiler on the CDI-MECHANICAL TIMER-S230M1 has become loose and seems to be missing some kind of screw which keeps it on and to buy another one is costing about £61 + vat. can anyone please give me some advice on how to rectify this problem,hope I have explained myself. Many thanks. Paul.