You have to drop the entire wiring harness into the body and pull it out of the pup hole.

This means the pots, jack, switch and grounding wire, which is usually attached to the back of the strap peg/saddle harness.

Then when it comes time to put everything back to gather use fishing line and tie it to the pots, jack, switch and ground wire and fish it back into place all at once. Make sure you use the exact same length of wire so you don't have any slack wire touching the inside of the body, which may buzz or reduce acoustic vibrations.

Also make sure you use a multi-meter to check for shorts before you put it back together.

This is the mother of all wiring jobs as far as I'm concerned.

Of course the greatest of the L5 players was Wes Montgomery and he did use BL's L450A1.6. Problem in using him for a reference. He played with his thumb, which gave him a much warmer and powerful attack than you can get with a pick, even picks as thick as I use. I do believe that I even sent Nocaster one of my triangle picks that I use all the time. It's my belief that this High-Fi pup is great for thumb users but youd be better off with a L450A4.8 which is going to get you closer to the juice of the 57 classic which I really like. He also used a Standel amp with a 15, which is similar to what I use and the 15 will definitely give you a warmer sound.

You can hear Wes play BL's pups on his verve recordings or at least I can. I wish BL could clarify at what date Wes starting to use his pups, or maybe he provided this date and I just missed it. Wes was using a L4 with a Charlie Christian bar pup prior to 1960. And more than likely he recorded his tour de force The incredible jazz guitar of Wes Montgomery with a ES175 equipped with a humbucker. He rarely if ever used anything but the neck pup. And I believe he strung his guitars with 14 gauge flatwound strings. The reason for the switch to BLs is probably because Wes was doing a lot of studio work towards the end of his life and he needed the no noise solution that BL offers and of course he needed to cut through. As for sound quality his Verve recordings offer a much better picture of his tone then do the sometimes cruder albeit more straight-ahead Riverside recordings.