Here below are pictures of two 10 section 4 column radiators being taken apart by Dan and made into one 18 section radiator.
He starts with removing each opposite end.To do this he removes the end caps this he does with the blow torches if stuck on tightly.
The thread inside as you can see from the pictures are thick with silt and muck,this is then cleaned out.
The joining collars are removed and again cleaned a paper gasket applied and these are used to join the two radiators together.
We here at BSP can reduce the size of your cast iron radiators and even extend them.
Call us for a quote.We are always happy to help.