Welcome to ModelEngineMaker !If you have problems registering or logging in, please use the contact menu option to request assistance.
... The final bend on the right was made with annealed copper and with the internal steel bullet rod, as you can see the bend is perfectly formed without the dreaded flat on the outside. The internal bullet is positioned inside the copper tube just short of where the bend commences. Somehow it prevents the outside of the tube from collapsing inwards