Open top tuning

[Bunk Stagnerg]

Help wanted
I found the articles in the Chronicle archives for the Pettifogger instructions on the cap gun modifications.
Does any one know the year and month that starts the open top modifications?
All I need is the year and month of the first one and I will take it from there.
Thanks
Bunk

[Coal Creek Griff]

This might be easier:

https://www.cascity.com/forumhall/index.php?topic=63467.msg751261;topicseen#new 

CC Griff