This procedure/approach was developed because of problems that arose over time with the MFX slits movement. The identified issue was difficult movement by the M4 slit (+X movement slit) that resulted in extreme vibrations of the entire unit, and the MDrive17 knob when turned by hand felt like it was clunking into place.
Consult with JJ X-Ray identified one potential issue that would not yield opening up the beamline: inside the unit each slit is mounted on a lead screw. The lead screw is connected to the motor externally to rotate by a magnetic double plate system (one vacuum side and one not). These plates could be assembled in such a way that the gasket between them is pinched or flexed such that it is rubbing the magnetic plate and causing disrupt in the movement of the slit. This would be the first way to approach the problem because it only requires venting the beamline. IF THIS IS NOT THE SOLUTION: you will have to open the entire beamline and remove the slit apparatus .
We began by venting the beamline according to the MFX protocol (found in MFX diamond window swap tab) with an additional PRV package at the downstream right-angle valve (preferred one has mud dauber screen and filter)