Last week I received a Jack Casady Epiphone, no mods, sounding great and set up perfectly by @Dark Horse with what appeared to be a set standard set of D'addario nickel rounds. Of course, me being me, I started tinkering with it immediately (keys, strings, gig bag, bridge), and I wanted to share some findings.
First off: the best news: my Mono sleeve gig bag fit the JC somewhere between snug and tight. The stock elephant ears on the giant headstock will get detuned, the padding fits tight in the shoulder of the body but it wasn't like I had to force the zipper to lock. Man was I happy about that.
Secondly: replacing the tuners hipshot ultralites was a good move for 3 reasons : 1) noticeably helps the balance; 2) it also helped the headstock fit the the mono sleeve better (I used the Y-key ones, I can live without elephant ears) 3) they are much better tuning keys, the ones that come stock are barely good enough at keeping the bass in tune.
Thirdly: I replaced the bridge with a Supertone and honestly, I am not convinced that made it a better sounding bass to my ears. It certainly is a different sounding bass with it, and actually to my ears moves towards a 'regular' P bass, more metallic sounding. While it is a beautifully made bridge, much better construction etc, more and more I do start to believe that the hardest material on a bridge does not automatically lead to a "better" tone. It is a matter of taste - I may return to the stock bridge, cheesy and clumsy as it is.
Fourthly: I put on my personal faves, light gauge Fodera steel rounds (40-100). The bass sounds great with these. Full, lots of attack, a brooding agression of sorts that fits this bass quite well, IMO