Issues with 340 distributor

Thats what im thinking? The shaft goes in from the bottom as shown in last picture. The pick up and advance mechanism on top pic sets down in distributor housing onto the knurls, the knurls are what holds the pick up and advance to the distributor shaft. The knurls hold the the shaft with the pick up and allows the shaft to transmit the rotation from the distributor gear to the rotor, pick up and advance