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Copper Grease
To facilitate removal of screws for future re lamping or other maintenance, apply copper grease to the threads of all screws being fitted for retention of bezels, grills or other top plates or retaining rings. Copper grease resists degradation due to heat and protects against difficulty in removing screws, particularly where stainless steel screws are fitted with aluminium parts,  It may also be used on screw threads of screw-off bezels or glare shields. Ensure surplus is cleaned off with a solvent to prevent staining in use.