Hi Mick
It sounds like someone has been a bit busy previously with this set! It reminds me of the sort of sets bought ex rental "untested off the pile" back in the late 70's from the likes of Carters in Ilkeston. What they really meant was "everybody has had a go and given up"
I am sure you will sort it... Give me a shout if you need a hand... I'll make the tea and do the swearing for you!
Rich.