Thanks for the pic. The Quark looks like it'll be easy to work on. I suppose, the first thing I'll do is upgrade all of the leads to deans wet noodle and add the caps.
The wire leads don't need to be changed, it's good wire.
Another thing, when soldering, I would make it so the cap is pressed right up against the case of the Quark, and the cap is perpendicular to the wire leads.
“The modern astrophysical concept that ascribes the sun’s energy to thermonuclear reactions deep in the solar interior is contradicted by nearly every observable aspect of the sun.” —Ralph E. Juergens