BOLTS AND BOLT CIRCLES
the Progress is a design contemporary with the "400" from Stuart models.
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0:00 introduction
1:16 all the ways to do this
2:00 The rotary table
4:30 Why BA threads?
10:30 Drilling the top cover
15:50 Shaping the gland
19:20 How it used to be done?
24:30 Tapping
25:50 Why BA? (cont.)
27:30 What if I stuff up?
35:00 Shortening bolts
27:50 Next Time
