Straight hole 3.25 x 18 mm
-The hole is not exactly in the center and/or
-a small puncture, a hole mark left by a punch on the edge
See the pictures:
In the picture, it is placed on a 20mm high pod blade (PR 125)
The shoulders of the blade have not been machined to fit, so they fit, but in the middle of the bolster you can see a small hole left by the punch.