Ok, I need your help, HF gang. I tried to start in on my first true DIY project, but am having sewing machine issues (actually, the whole freakin' subscription). I'm trying to sew polyester straps on my sewing machine I got for Christmas (early). Every time I start sewing, I jam up after just a few stitches. The thread knots on the bottom and I'm stuck. What am I doing wrong? I've tried changing to a heavier needle, adjusting the top tension, adjusting stitch length and even changing thread. I'm at my absolute wit's end and don't have the foggiest as to what to do. Do any of the DIY crew have any ideas, tips, tricks or advice? Anything would be greatly appreciated. Thanx a mil in advance!