i love this mount, good quality, the arms do lock from moving( almost wish i could move it more freely sometimes with out loosening the articulating points. sometimes when you screwed down locking points ,you can still swing and adjust it with some resisitance, but the teeth do lock it down so u have 2 loosens to do minor adjustments.( in my use ,i do move it often) i was looking for a removable tv mount preferably with removable arm this fit the bill, i just lift my 32\ on and off the plate