I wanted a baseboard B5 valveholder, so decided to make one. This is made from two pieces of brown acrylic sheet cut into circles with a round saw. The sockets are brass tubes from a model shop with the top ends opened out a bit by getting them red hot, putting a centre punch in them and giving a sharp tap with a hammer. I then glued them into the holes with Gorilla superglue. The five connection bolts had five thin wires soldered to them before fitting in the holder. The wires were wrapped round the tubes underneath, and soldered. The tubes protrude beneath the valveholder, but this is accommodated by drilling a large round hole where the valveholder is to be fitted, using a wood-cutting bit!
Very pleased with the result.
Bob