Can anyone tell me were the bubble in the little level should be for the correct angle, there is a clear section and a section with a lot of close together lines, any ideas?
Really no "correct" angle as the lines on the glass were there to allow the operator to set the angle within those parameters. The first line was usually 6 degrees of pitch and each line after was approx. 1/2 degree of pitch. Most games I saw regarded the "recommended pitch" to be 6 1/2 degrees which placed the head of the bubble between the first and second line. Each machine manual had a reference to the bubble so you might have a squiz at the manual.
