Here's how I magged an ABU 7000
The only thing I made is the carrier, it’s the teardrop shaped piece of 1/8” (3/16” will also work) aluminum. There are two threaded holes in the carrier, one is to attach it to the reel and one is for the magnet adjusting screw. The spring is from a bicycle quick-release wheel. The 2 rare-earth magnets (1/4” x 1/10”) are epoxied to a ny-lock nut. The ny-lock nut stays put on the end of the cap screw and won't vibrate or shake loose. I’m not sure what size screws I used, but they fit through the existing clicker holes in an Abu 7000 side plate, the side plate is not drilled or modified, and the click can be re-installed if I want.
When adjusted and tuned with the right oil and brake blocks, this reel won't backlash, yet casts as far as any other baitcasting reel!