Well if you were, Radio Shack wouldn't be going out of business! (/humor)
Seriously, Radio Shack isn't even good for the occasional spare part anymore. It used to be I could go to RS and find any resistor, transistor or capacitor I needed to fix something. As the years have gone by, the parts they stock and keep in the store just kept dwindling. Personally I knew they were doomed when it cost more to order a part from their catalog in shipping cost alone, than the part itself cost.
Not sure what they were thinking relying on cheap remote control cars and cellphones as their business model.
I went to a Radio Shack last week. A gal clerk came running over and insisted on helping me. So I asked her for a 22 to 24 gauge stranded wire pair spool, preferably black and red. She hands me some electrical 16 gauge solid wire. I said forget it. She hovered around me trying to hand me various wiring, all wrong. I kept repeating myself, then told her to go away. Sigh! Can't find the soldering tips for my torch soldering iron. Can't find the electrical connectors I want. All they have are cellphone batteries and toys. Used to be able to get chips and resistors and other components easily 30 years ago. Now they're a joke.
I really admire people like you that dig in and fix stuff like that.
I did manage to replace a broken micro USB jack on my tablet. Used the mini screw driver set I bought at Radio Shack come to think of it.
I had no idea a screw could be that tiny - had to stack up two pairs of reading glasses on my head just to see it.