Loctite 660 Quick Metal Retaining Compound Press Fit Repair Top Pick Locktite 660 Quick Metal Retaining Compound, Press Fit Repair is a creamy, non-running adhesive/sealant used for repairing worn coaxial parts without remachining. Enables re-use of worn bearing seats, keys, splines, tapers, or for retaining shims. Restores correct fit to mating assemblies. Fills gaps up to 0.020" diametral clearance. CFIA Approved.