Mounting collar for Spark Plug Gear 50W End Fed Half Wave Antenna 49:1 unun

I use the excellent 50W version of the 49:1 unun by Spark Plug (WO9B) for some of my portable end fed half wave field antenna deployments.  I wanted more options to secure the transformer in the field, so I designed this small slip-fit collar that allows for more attachment options for paracord or elastic shock cord.  I like to use it with an S-clip, so the shock cord can be removed quickly and easily (I'm not good with knots…).  Show in the pictures is a 3D printed S-clip designed by K6ARK and can be found here.

I recommend printing this in PETG, or even better, ASA filament.  I printed mine with 100% infill and random seam locations for a little strength.  The white Spark Plug “insulator” tubing appears to be PEX tubing or some other non-precision tubing, so you may need to experiment with scaling percentages to get the collar to snugly fit over the insulator.  If the collar fits snugly to the tranformer insulator, no glue is required (or recommended).  No supports required during printing.  If you print this and like it, show us some pictures of an antenna deployment!  Have fun and 73.