System for fixing object to plate utilizes washer which abuts against conical dome structure of plate

摘要

The object (1) is fixed to a plate (3) via a washer (41). The plate comprises a conical dome structure (2) to retain the object by abutting the washer against it. The dome has a convex (2A) against which the washer is abutted. An Independent claim is included for a fixing method.