T mounts "click" in place

I am not an expert on T mounts although I am familiar with their use.

I have recently bought a Panagor 300mm mirror lens from a member here (thanks John).

I sourced a T mount on eBay which fits the lens correctly - but does not "click" in place on the camera body when mounted.

Is this because it is a poor T-mount (I guess there is massive variation in quality given the number of manufacturers)? or does a T-mount not click in place anyway.

I am sure the T-mount I used to fit MF lenses to my 4/3 camera did click - but I'm doubting myself now.

TIA

I've got a couple of eBay's finest T-mount to PK adapters and they both click into position, I'm afraid.

If you look at the face of the T mount, there should be a groove that engages with a pin on the camera body adjacent to the lens release button. It is possible that the groove on your mount isn't very well machined, as you say and doesn't line up with or fit the pin.

It's been a while, but I'm pretty sure my T mount clicks into place.

I have one T-mount lens. It definitely clicks into place.

Andrew

Fortunately T mount adapters are cheap, so getting a better one won't be a major issue.
I've had a similar issue with a M42 lens to which I attached an adapter (rather than having it clip into the camera body).
As it's usefully to have the security of the pin I filed a small recess at the right pint in the base of the lens. Not as ggod as a properly machined one (the lens will wobble slightly on the mount) but it stops it comming off by mistake.