Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

A useless bit of information.
Srings , washers , bolts  are what you need for soldering internal bushes
 Spring larger diameter than bush outside
Bolts to fit bush thread .
Washer to fit bolt under head and larger than spring .
 Method
 After cleaning and ready to solder bush in place
Insert bush with ring of solder
Place washer on bolt then spring ,screw bolt into bush .
Spring is compressed between washer and boiler surface thus holding bush is place
 It will also work when removing endcaps and not wanting internal bushes to drop off .

Cheers
Dennis