I've got a Delco EST distributor that I suspect the pickup coil is bad. One of the leads shows resistance to ground, should be infinite. So I'm having problems on removing the pick up coil. I've got the cap and rotor off, disconnected the wire leads. I've got a service manual that says to pry off the retainer. Don't see any retainer and pickup coil doesn't slide off on the shaft. Does the shaft need to come out of the block to remove the pick up coil? Attached a photo. Help appreciated.