Well, I'm not going to take it out and start over, that's for sure.
So as promised, here is a photo of the sensor inserter.
The hole on the bottom is for the sensor hub, not the needle. You slip the hub into the hole, and the guide needle handle rests in the grove.
Boy, this glue they use is wicked! I highly recommend you get some Medtronic "Detachol" to clean your skin off after you remove a set. I've got some on order, but it has not arrived yet and I'm running out of adhesive-free skin on my stomach. Looks like tree rings! I've scrubbed until my skin turns red, but no luck. This stuff just doesn’t want to come off. I guess it has to be heavy duty to hold the transmitter securely for three days, but this is ridiculous!