In parting out a frame, I removed the buzz bolt and noticed the clearance between the frame and spacer bar. I did not try torquing down the buzz bolt nut at the time so I didn't notice whether the bolt was tightened enough to eliminate the space between the spacer and frame. NO WONDER THE THING buzzed!
Click on the url to see a pic of the spacer and frame.
https://imgur.com/a/8IbojXyI just found my pipe clamp and with considerable effort was able to squeeze the frame enough to capture the spacer tightly. See that pic below...
https://imgur.com/a/V6K8wDSBased on having to raunch on the pipe clamp really hard, you gotta torque the nut mightly.
