HR80/91/92 Baseplate pin fault?

[Bracken26bwr]

Following on from hot summer 'evets' (as they call them these days) I have had 4 or 5 controllers HR80 & HR91/92
come up with operating faults that seem to be related. I find the baseplate actuator pin is loose in the centre bush.

Consequently the demand is not met as the actuator pin slips in the adaptor bush during valve operation.
I have checked a few good ones and find them tight/fixed(?). I didn't push too hard to avoid adding another to the pile.

My question is....should the valve baseplate pins be a) tight fixed or b) an interference fit ?

An interference fit would provide a "clutch fail safe" should the final rad valve fail fully open.

Repositioning and supergluing the pin would restore a fixed mode (a) but at the risk of loosing a clutch failsafe.

Anybody else with a similar problem?

New valve baseplate adaptors (50064648-001) seem to be out of stock everywhere these days.

[Richard]

Baseplate pins have always been loose. Not an issue.

There is only 4mm of travel in any case and on most TRV's when they are screwed on 1-2mm.