An insert holder has a cross section with a main positioning side abutting {HEAD ~ a first primary locating side} of the insert, and having {TAIL ~ a secondary positioning side} abutting one of the insert secondary locating sides 
An insert holder has a cross section with a main positioning side abutting { HEAD ~ a first primary locating side } of the insert , and having { TAIL ~ a secondary positioning side } abutting one of the insert secondary locating sides
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH