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(may have been possible on my 'dream' 5 axis machine: I wish)
Very very nice Filing (handwork) .... but inquiring minds like to know what the small hole in the last picture is used for Per
The driver tucked the end of the rubber pipe inside of his cotton crash?? helmet. He could hear when the pop off valve blew off..... that was his signal to pull the next gear.
Hope a backfire never went up that tube from the pop-off valve! That would be distracting, to say the least!