U.S. Products DRIMASTER 3 UPHOLSTERY TOOL - Manual (Page 19)

3-5: Tool Maintenance
4. Carefully fit the nose to the end of the tool body while aligning the mounting flange
over the top and bottom halves of the tool.
5. After the nose is seated, install the four 4-40 mounting screws using the thread
locker indicated in Figure 4-2.
The material of the nose can slowly wear down over time, due to regular use; this
is typical and is not considered a warranty issue.
HydraMaster recommends that the operator/distributor stock replacement parts
in the service vehicles.