Hi all,

In the attached file, I'm trying to get the bottom (flat) surface of "SUBASSEMBLY Thermostat" to be physically tangent to the outer curved surface of Lid, while being concentric with the circular sketch, "SKETCH Therm Ref".

However, when I add a (seemingly) appropriate Tangent mate between the two surfaces, as seen in the file as is, it appears to have no such effect on it.

Am I fundamentally misunderstanding how Tangent mates work...?

Any help is appreciated; thanks in advance !