A tutorial on the Mark 4 has been done, so this is a quick look at the modular type, drop in magnet cartridge of Shimano`s marvellous Mark 4 Mag.
(http://i1286.photobucket.com/albums/a601/george8322/P1030216_zps5mpdfyzq.jpg)(http://i1286.photobucket.com/albums/a601/george8322/P1030218_zpsacklc1oo.jpg)
(http://i1286.photobucket.com/albums/a601/george8322/P1030219_zpszoulfihi.jpg)
(http://i1286.photobucket.com/albums/a601/george8322/P1030220_zps9ayq38fb.jpg)
(http://i1286.photobucket.com/albums/a601/george8322/P1030222_zpsch6z2pjg.jpg)
(http://i1286.photobucket.com/albums/a601/george8322/P1030223_zpshkplifsg.jpg)
(http://i1286.photobucket.com/albums/a601/george8322/P1030224_zpsfpwux8hy.jpg)
(http://i1286.photobucket.com/albums/a601/george8322/P1030225_zpsfwu9sluc.jpg)
(http://i1286.photobucket.com/albums/a601/george8322/P1030226_zpsiofylkcl.jpg)
(http://i1286.photobucket.com/albums/a601/george8322/P1030227_zpsskls1pwe.jpg)
(http://i1286.photobucket.com/albums/a601/george8322/P1030228_zps6rhbrdnn.jpg)
(http://i1286.photobucket.com/albums/a601/george8322/P1030232_zpsxgdbdcht.jpg)
(http://i1286.photobucket.com/albums/a601/george8322/P1030233_zpsvyucks0g.jpg)
I have owned a couple of other magged reels, but this is the most robust setup I have seen in an adjustable mag.
cheers
Basto
Thanks for the breakdown on the Magnets. Don't have a Mag Mark 4 but have a Mag Mark 3----Sweet reel. Call it the Whisper Jet. I have several of these old Tritons of different sizes and styles and fish them regularly for Big Blue cats. Great reels with great gear ratio (5/1) and very fast retrieve rate (33"/34" per turn).
I share your enthusiasm for the old Shimanos. They are great reels. I have a Mark 1 and 2 and now the Mag4. I would like to get a Mark 3.
cheers
Basto