6. The improvement of claim 5 wherein a) the receiver alignment structure is a first structure that is at least one of a first pressure tab and a first groove; and b) the insert having a second structure that is at least one of a second groove cooperating with the first pressure tab and a second pressure tab cooperating with the first groove.
5. The improvement of claim 1 wherein a) the receiver has an integral alignment structure cooperating with the compression insert, the alignment structure directly engaging the insert and aligning a connecting member receiving channel of the insert with the receiver channel.