Lowest OBP by a DH, minimum 400 PA

This is along the same lines as the last post, only now I'm using on base percentage because it's a better measure of how a player avoids making outs. The restrictions are the same: 400+ PA and 75+% of games as a DH.

For fun, I'll list the top (bottom?) twenty seasons:

1. George Bell, 1993, .243
2. Dave Kingman, 1986, .255
3. Ken Singleton, 1984, .286
4. Lee May, 1978, .286
5. Dave Parker, 1991, .288
6. George Bell, 1992, .294
7. Lee May, 1979, .297
8. Alvin Davis, 1991, .299
9. Reggie Jackson, 1984, .300
10. Jeffrey Leonard, 1989, .301
11. Eddie Murray, 1994, .302
12. Willie Horton, 1978, .303
13. Andre Thornton, 1985, .304
14. Josh Phelps, 2004, .304
15. Dave Parker, 1989, .308
16. Dave Kingman, 1985, .309
17. Reggie Jefferson, 1993, .310
18. Sammy Sosa, 2007, .311
19. Carl Everett, 2005, .311
20. George Brett, 1993, .312

George Bell and Lee May are the only two players in MLB history to post an OBP under .300 in more than one season as a full-time DH.