A tutorial on making locks from scratch would be like a mail order hair cut,difficult indeed.
Back in 1970,I gave Mr.Cochran tips and pointers on lock making as well as types of materials and sources,also permission to copy the internals if he wanted to. !970 was the year I went to the linked mainspring in several different flintlocks I was making. Mr.Cochran did a creditable job of copying my earlier type and as far as I know,they worked well. All the help I gave him was by phone in the evening after work.
Most lock makers use investment cast internal parts but I am not interested in having a glitch in someone else's quality control become my glitch. Mass production is OK (maybe)but I prefer to be the fanatic about small details.
At this time I am making 10 Twigg locks using the elegant external parts from R.E.Davis Co. and am now working on #6. I tried to get a picture posted for this forum of this lock and the double set trigger I made with it but Photo bucket isn't compatible with this ancient MSN2 system I use.IF anyone is interested in seeing these parts, my personal E mail is <email@example.com
>.I will send the picture I have taken with our son's camera phone..
The scratch built lock shown on this forum is a fine job and I get tired just thinking about the work involved in it. The closest I get to this today is milling a lock plate for a Hawken caplock or an English 4 screw as used on a Rigby or some similar long range rifle.I have pictures of those as well if anyone is interested.
I use cast steel hammers on these caplocks but that is all.