Yes, you use the washers on the top and bottom, if they will fit snug in the grips. If not and you can not get them in the grips with washers, you do not need to use them, providing they are snug in the grips. On my Caliber 30 and the G4 Carbons, I use the washers, they are very snug and you have to use some force to slide them in the grips, but once in, they are nice and smooth. On my Sceadu EVO 50 my Mavriks do not need the washers, the blades fit snug without. Hope this helps, and happy flying! They are nice flying blades!!!