Bike carrier hitch hauler captive end plug

Captive design uses the stock 5mm fastener to lock the end cap in the carrier.  These wont fall out like the stock one.Print out of 95 TPU with 5 walls. at 15% infill.  Easily prints with no support.  About a 7 hour print for 2 on a bambu x1c.  The inside of the tube should measure approx 57.25mm x 38.25mm.  you can also print out of nylon, or asa.  petg or tpu recommended.