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 bushing will work with grips not less than 0.180" thick when used with standard head grip screws and 0.190" thick when used with shoulder head grip screws.
O-rings are not necessary, but strongly recommended because of the benefits they provide, such as eliminating loose grip screws and scuffed frames, and providing the most secure mounting available for 1911 grips. You can feel the difference.
Note: "All Service and Warranty Issues Must Be Directed To Manufacturer."