Hey Zach........I used a drop or two of Gorilla super glue on the end and let it hang over a table overnight.......that sucker is locked on for life!The Wiz!You can make your passthrough last a lot longer by reinforcing the bit of wire that goes into the cherry end of the passthrough casing. You can use a small piece of electrical tape or, ideally, heatshrink.
Two of my passthroughs have broken now because this wire got stripped inside the plastic cherry. Passthroughs will last exponentially longer if you reinforce the wire.