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Morning all. I'm replacing lockshield valves with TRVs in some fairly old radiators. The radiators work fine but the tails on the TRVs - Drayton TRV 4s - can't be screwed fully into place with a spanner because the radiator sides are recessed and not flat. I can't use a socket set as the nut and olive on the tails get in the way so I was wondering if anyone has had the same problem and how you got past it. Many thanks for any helpful ideas!!