All parts are machined from solid brass and have integral bosses.
Pinions and gears mesh at standard spacing with:

10teeth....with 28t. and 66t.
11teeth....with 26t. and 66t.
13teeth....with 26t. and 65t.
15teeth....with 22t. and 60t.
16teeth....with 22t.,24t. and 60t.
17teeth....with 20t. and 57t.
19teeth....with 19t. and 57t.
20teeth....with 17t. and 56t.
22teeth....with 15t. and 55t.
24teeth....with 15t. and 16t.
25teeth....with 13t. and 50t.
26teeth....with 13t. and 50t.
27teeth....with 10t.,11t. and 50t.
28teeth....with 10t.,28t. and 45t.
30teeth....with 10t. and 45Z.
38teeth....with 38t.,76t. and 152t.
45teeth....with 30t. and 45t.
50teeth....with 25t. and 26t.
55teeth....with 22t.
56teeth....with 19t. and 20t.
57teeth....with 19t. and 20t.
60teeth....with 15t. and 16t.
65teeth....with 11t. and 13t.
66teeth....with 10t. and 11t.
70teeth....with 45t.
76teeth....with 38t.
95teeth....with 19t. and 38t.
114teeth....with 38t.,76t. and 114t.
133teeth....with 19t.
152teeth....with 19t. and 38Z.
171teeth....with 19t.,57t. and 95t.
For more technical data on each part click the part link.