Steve the clock came from axeminster tool at Warrington £4-50 l think and £4-90 delivery don't know about the metal backing cup all l did was us a spade drill bit think that's what you call them but it worked you also get a belt that fits over the inside edge of the clock l think that is if you make it abit too wide, there is a load of them on Axminster site bit dear but was in a rush to get one will try other places next time but will say very very good on delivery 2 days so that's a plus.