I have no stabelizer on my blocks. All i do is like the guy in the video. I take one piece of scrap lay it flat. Then i take another scrap of different shape, turn the edge over about 1/4 inch seam I press that seam in place. Then i lay the turned over edge on top of a raw edge of the first scrap and pin. I do about 2-4 more pieces of various shaped scraps which are all then pinned in place to do my deco stitching. In my machine (Brothers Disney SE27OD i am using all purpose thread by coat n clark purchased from walmart. Tho i do have embroidery thread here to use on other projects. I stitch in place using my desired setting for the deco stitch., Yes there are 3 seams then. No i am not using varigated thread. I may later use heat n bond Light weight later on to stabelize the back of each block if i feel it is necessary. Like i said "my way". It maynot be the proper way or professional way in making a crazy quilt. This is my first crazy, so all is done by trial and error. So far I haven't had any problems with tension. I did notice in some stitches, there were 3-4 loose stitches in the beginning of a seam. I hold my thread until to sew a few stitches and feel it is safe to continue. If i have a seam with a heavier thickness due to edges being turned over, I use a more straight stitching design and i sew it slowly to prevent needle breakage etc., However, it is simple for me , not alot of technical thinking here,lol and im having fun making my 8 inch blocks. In the video -he doesnt talk but i watched his technique several times especially the first video. At first i thought wth? But then i seen how he does it just by turning over one edge and stitching it in place. So like i sd, is all by trial and error.So far not many errors other than getting the edge of a scrap caught under the needle due to not holding the thread at the start of stitching. lol Well this technique is working for me so far and i have 20- 8" blocks finished. Many more to go lol. Like i mentioned in an earlier post, it is like putting a cloth puzzle together. No rhyme or reason just having fun fitten n stitchen.