These bushings are easy to install and remove. Loctite is not necessary for installation if they are torqued to the proper spec (27 in-lbs for steel frames & 20 in-lbs for aluminum). This full size bushing will work with grips not less than 0.245" thick. O-rings are not necessary, but strongly recommended because of the benefits they provide, such as eliminating loose grip screws, scuffed frames and the most secure mounting available for the 1911. You can feel the difference.