I'll try...
1 Ext
2 MLC by me
3 MLC
4 Elect motor or dirty alum
5 Elect motor
6 #2 Copper
7 Dirty stainless??
8 Some items are die cast zinc
9 MLC
10 MLC
11 MLC
12 Alum motors / transmissions??
13 Dirty alum
14 MLC
15 MLC
16 not sure
no 17
18 MLC
19 Ext
20 Cast alum or diecast zinc
21, 22 & 23 elect motors
no 24
25-28 no pics
29 Dirty alum
30 dirty alum
31 dirty stainless or dirty crome plated brass