A mounting tool (1) for mounting a friction-welding boss (9), wherein the mounting tool (1) includes a drive shaft (2) with a first end section (3) adapted to create a detachable force coupling with the friction-welding boss (9) or an adapter and a holder is arranged spring-loaded at the first end section (3) and at least one cutting means (6) is arranged at the holder (5). A milling adapter (10) includes a first end section (11) adapted to create a detachable force coupling with a mounting tool (1), and a second end section (12) including at least one cutting means (13).