Hammers clacking!

[Cliff Lesher]

 I checked the flange and rail screws which were tight.  This is an
> aluminum rail.  I did not check the action bracket support bolts, but I
> will be back in there in two weeks when I install a couple of strings. I
> have heard a hammer make a sound like this when the upper glue joint was
> broken, but it isn't that.
> 
> What am I missing?

Warren,

Lower glue joint?

Cliff Lesher, RPT
Lewisburg, PA