I'm using tractor supply wire too, for maple and cattle & sheep! Here's the knot I started using after the crimp sleeves failed miserably on both fence and mainline. Gripples work GREAT, my best friend manages grazing alotments for the Monongahela National forest, and that's what they have been using for years- however, I found this video, and have yet to have a figure 8 fail. My mainlines, and I even have some pump lines suspended, they are stretched TIGHT. https://www.youtube.com/watch?v=P9FOEvooxqY
'12 15 jugs - Steam pans
'17 125 3/16 - 18" x 72" drop flue on homemade arch
'18 240 3/16 - Deer Run 125
'19 450 3/16 - Converted RO to electric/added a membrane
'20 600 3/16 - Maple Pro 2x6 Raised Flue, added AOF/AUF
'21 570 3/16 - Built steam hood, Smoky Lake filter press
'22 800 3/16 - Upgraded RO to 4 4x40
'23 500 3/16 - Re-plumbed RO, new "Guzzler"
'24 500 3/16 - Steam Away, DIY 8x40 RO