Some elasticity from a drop of RTV silicone behind the scribe in the nozzle, but it _does_ require accurate bed leveling.? I actually dulled the scribe point with a diamond hone down to about 0.003" to avoid cutting the copper, which _did_ cause too much drag.? I'm using a BLTouch sensor and 16 point M29 command with a flat glass plate on the bed.?
The scribe to nozzle bore fit is +0.002", slide fit.? Not sure what you are referring to as "wobbly".? This surface mount board shows pretty fine detail:??(note the scale).
Let me know if I be of any further assistance!
73,
Brent, AB1LF
Brent DeWitt