[morzh]

Back from vacaciones.
Necessito ayuda

Now that I have just finished re-capping (I was surprised: most resistors are within 5-10% so I only had to change 6 of them that went outside 20%. None was really off. Very strange. Those ARE original Philco resistors. Anyways.) and put all tubes through the tester (most act like new) I have one last step to complete before I try to power it.

My tuning cap is really loose. So I decided to look how it is secured: it is set on rubber grommets with the screws that seem to go through insulated from the chassis.
However the frame of the cap shows connection to the chassis.
Upon further looking I saw that fat copper braided connection that stems from under the cap #20 (I have Code 124 Philco, so here's the Rider; look at the p.3 right in the center of the assembly chassis bottom view) and then solders to the rear screw that holds the tuning cap.
That obviously is the GND connection.

Why then isolated screws?
And is this braid soldered to actual screw cap (which is probably steel) the original way it was done?
http://www.nostalgiaair.org/PagesByModel...013149.pdf