Squeaker Full Member Joined May 6, 2012 Messages 184 Nov 2, 2017 #1 Anybody have a guess? The small round hole curves down in the chamber to meet the rectangle one. Attachments IMG_20171102_2139.jpg 30.2 KB · Views: 173 IMG_20171102_1011.jpg 35 KB · Views: 150 IMG_20171102_20298.jpg 32.1 KB · Views: 150