The L-500 is a 'bucker and I thought the L-290 was a noiseless pickup. Maybe not. Even though long runs were with sheilded wire, I had some single coil sounding hum in the guitar. Not enough to really get me down but though to bug me. Confident that everything was grounded properly, I figured this was a good time to put the shielding issue to bed, or at least to my own satisfaction.
Friday I pulled the whole guitar apart and started sticking copper tape in the pickup and control cavities. Spare moments over the last few days got most of the job done. This morning I put the last few pieces in and re-assembled it. I strung it up and plugged it in. Crickets. Stand back 200 feet! This thing is totally silent with the volume all the way up. I am sold on copper sheilding tape as of today. It's a solid day of crossing-your-eyes boredom but well worth it, in my opinion.
The vibrato springs are adjusted and the nut is cut but the string height still needs to be set and I'm out of time today. It won't hurt for the strings/vibrato pads to settle in for a day or two prior to messing with it any more.
Also, I ordered some black tuner buttons to tie it all together. Photos after they arrive and are installed.