I have an Evhome system setup with my heat only boiler / vented cylinder, to date I have 3 x HR92s but am building my system. Has anyone been able to fit the HR92s to Giacomini's TRVs (see link below)? The thermostatic head has a clip on system to the TRV valve. I have tried using the collar that cam with the HR92 but the shaft inside does not seem long enough to push down the TRV.

Any thoughts (thanks in advance).