Side by side of CD 128.4 Big Mouth insulators With large and small pinholes

By Mike Guthrie; posted November 12, 2015

View Original (1478 x 453) 118KB

 


This photo is of two Big Mouth insulators I used to own, one of which had the 1" diameter standard pinhole (the piece on the right) while the other had the standard iron pin hole diameter with the thimble intact.

In over 34 years in the hobby I've only seen one other with the 1" pinhole.

451942810