Double Norwich Court Bob Major

6-part

5008 (no 1)

23456   I    F    O
34256             -
54326   s        
24356   -         2
43256       (ss)  -
25346   -         -
23465        A    -
Repeat five times, omitting (ss), and calling B for S in parts 2,3,5,6.
A═bobs at 6,O,W,F making 9-lead course, so the bob at O is at lead 8 of this course.
144 cru in the minimum number of changes. Computer checked. 

5008 (no 2)

23456   I        O
34256            -
52364  (-)   A   -
32654   -        2
26354  (ss)      -
23564   2        -
Repeat five times, calling s for (-) in parts 3 and 6, and omitting (ss) in all parts except the first. 
A═bobs at 6,O,W,F making a 9-lead course; 144 cru in the minimum number of changes. Computer checked.

5008 (no 3)

23456   I      O
34256          -
45236   -     (ss)
53246   -      3
42356   -      -
23564   *  A   -
Call s at * in parts 3 and 6.
Repeat five times, omitting (ss) in all parts except first.
A═bobs at 6,O,W,F making a 9-lead course, so the last bob at O is at lead 8 of this course, and the course end comes up at the following lead end.
Tittums, backrounds, and the 144 cru in the  minimum number of changes. Computer checked.

2-part

5024

23456   I   F   V   H   O  
42356                   2
35246   s               2
23654               x
36254                   -
372546      s   3
623547      s           -
32564   -               2
53426               x
34265          A        -    
42365                   -
26345   -               3
34526   2           x
54236   -               2
32456   -               -
Repeat.
A=bobs at 6,O,W,F making a 9-lead course; the last bob at O at the end of this course is actually at lead 8 and the course end comes up at the next lead end.
Backrounds, all the 5678s and 8765s with 5678s off front, with 128 cru.
Computer checked.

1-part

5008 (no 4)

23456    I   F   V   H   O
42356                    5
62345    s       s
42365    s               6
52346    s       s       3
36254    s       s       2
237546       s   3       2
357246   -               6
752346   -               2
532746   -               3
273546   s               2
732546           3       -
352746   -               3
352647   -   -           4
23456                x    
6=BBSBBS 5=SBBSB 4=BBSB 3=BBB 2=BB  
Queens, tittums, whittingtons, backrounds, all the 5678s and 2468s with 22 8765s and 20 5678s off front; 88 cru. Computer checked. 

5040

234567   I  6  F  V  H  O  W
24356                   s     |        
32456                   -     |     
63245    s        s     3     |A      
43265    s              3     |      
32546    s        s     -     |     
25346                   2  
26345    s        s     2
273546         s  3
632547         s        -
25364    s              2
53264          ss       - 
32456    s        s     -   
23546          A            
52346                   2
36254    s        s     2
372546         s  3 
623547         s        -
357246   s              3  -
265347      x
52364                x
23456    s        s     -
Queens, tittums, all the 8765s with 5678s off front, 2 courses of 8756s with 6578s off front, and 144 cru. Computer checked.

1-part (continued)

5121 (5009) (no 1)

(23456)   I     O
 25346          -  |
 43265      a      | 
 36245    -     3  | A
 64235    -     ss |
 32465    -     -  |
 32654      A    
 26354          -
 63245      b
 34265    -     3
 56234    -     ss
 32645    -     -
 32564      2A   
 25364          -
 53246      b
 23456    -     2
Start at backstroke with a single:
 12345678
 13254678 lead end
 31526487
 35124678
   etc
a=1,2,3,4,5,8 making a 9-lead course.
b=s1,2,3,4,5,8 making a 9-lead course.
Tittums, 136 cru including all the 6578s. For 5009, omit any ss. Computer checked.

5121 (5009) (no 2)

(23456)   I   F   V   O     
 25346                - |      
 43265        a         | A  
 36245    -           3 |  
 32465    2           - |   
 32654            A     
 26354                -
 63245        b  
 34265    -           3
 32645    2           -
 32456            A    
 24356                -
 53264        a
 372546   -   s   3  (3)
 362547       s       3
 32564    2           -
 25364                -
 53246        b
 23456  -             2
a=1,2,3,4,5,8 making a 9 lead course.
b=s1,2,3,4,5,8 making a 9-lead course.
Start at backstroke with a single:
12345678
13254678  lead end
31526487
35124678
  etc
For 5009, call ss instead of (3). Tittums, 14 8765s with 12 5678s off front, 16 468s and 136 cru.
Computer checked.

5121 (5009) (no 3)

(23456)    I   F   O
 32546             s                
 25346             -
 45326     s          
 52346     -       3
 43256     -       -
 32564        a     
 25364             - |
 36254     2       2 |         
 62354        ss   - | A
 53264     -       - |
 32645        a      |
 32456 A omitting ss            
 24356             -
 35426     s       2
 42356     2       2
 23564        a     
 23645       A*
 23456 A omitting ss
a=2,3,4,5,8 making a 9-lead course.
Start at backstroke with a single:
12345678
13254678
31526487
35124678
  etc   

For 5009, omit ss at F at A*. Tittums, backrounds, with 8 each 8765s with 5678s off front, with 136 cru including all the 6578s.