Hi all, first post. I have a radiator with a Maxitwin 1469 valve at one end. It seldom gets hot when the others are fine. I have messed about with the valve on the others ( closing them down a bit) but without success. Beside the valve main adjuster, there is a 'cap' on what I think is the return from the 'internal pipe'. Is that so, as I am unable to loosen it to get access. Any advice would be welcome. I think these are rare as hen's teeth so few people have experience. By the way, the pipework is a midi system of some years with10mm bore pipework with manifolds for distribution. Phew...