A device comprising: a first plate ; a second plate adapted for receiving a light modulator; one or more biasing mechanisms (107-1, 107-2, 108-1, 108-2) configured to bias the second plate in a biased position relative to the first plate , the one or more biasing mechanisms (107-1, 107-2, 108-1, 108-2) configured to allow the second plate to move with respect to the first plate ; a first wedge device configured to interact with a first edge of the second plate to move the second plate , relative to the first plate , against the one or more biasing mechanisms (107-1, 107-2, 108-1, 108-2); a second wedge device configured to interact with a second edge of the second plate to move the second plate , relative to the first plate , against the one or more biasing mechanisms (107-1, 107-2, 108-1, 108-2), the second edge of the second plate being about perpendicular to the first edge of the second plate ; at least one first wedge device adjustment mechanism (141-1, 141-2) configured to adjust a position of the first wedge device relative to the first edge , to move the second plate ; and at least one second wedge device adjustment mechanism configured to adjust a position of the second wedge device relative to the second edge , to move the second plate ; and wherein the at least one first wedge device adjustment mechanism comprises: a first screw configured to rotate the first wedge device against a pivot to rotate the second plate ; and a second screw configured to slide the first wedge device along the first edge of the second plate , to move the second plate in a direction perpendicular to a movement direction of the first wedge device . a first plate ; a second plate adapted for receiving a light modulator; one or more biasing mechanisms (107-1, 107-2, 108-1, 108-2) configured to bias the second plate in a biased position relative to the first plate , the one or more biasing mechanisms (107-1, 107-2, 108-1, 108-2) configured to allow the second plate to move with respect to the first plate ; a first wedge device configured to interact with a first edge of the second plate to move the second plate , relative to the first plate , against the one or more biasing mechanisms (107-1, 107-2, 108-1, 108-2); a second wedge device configured to interact with a second edge of the second plate to move the second plate , relative to the first plate , against the one or more biasing mechanisms (107-1, 107-2, 108-1, 108-2), the second edge of the second plate being about perpendicular to the first edge of the second plate ; at least one first wedge device adjustment mechanism (141-1, 141-2) configured to adjust a position of the first wedge device relative to the first edge , to move the second plate ; and at least one second wedge device adjustment mechanism configured to adjust a position of the second wedge device relative to the second edge , to move the second plate ; and wherein the at least one first wedge device adjustment mechanism comprises: a first screw configured to rotate the first wedge device against a pivot to rotate the second plate ; and a second screw configured to slide the first wedge device along the first edge of the second plate , to move the second plate in a direction perpendicular to a movement direction of the first wedge device . <EOS>