Ok, job done!
The seperator works very well. I filled it with oil and screwed it down firmly to a work surface. I washed all the components and re-assembled it, them put a litre of lukewarm water through it to warm it up as instructed.
Then I put the evenings milking (5 pints, warm) through it. Hey Presto! Skimmed milk and cream.
You are supposed to start it off gently, winding the handle up to speed, then open the tap to let the milk in. I thought the machine might be hard to wind but you are really only keeping up the momentum and it's no work at all to turn.
Skirza, it does have a "cream screw" but by your descrition it is not exactly the same design as yours. I have not messed with that bit yet, but with the factory settings got something about the thickness of single cream.
The instructions also say to put a litre of the skimmed milk back through at the end to wash out the last of the cream.
You can find them at
www.merry-farm.com and based on this purchase I'd recommend them.
I notice that they are now on ebay, which I don't think they were when I ordered. At a glance, I think the prices and shipping are lower on their own website.
Hope this helps people!
Dave