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How are you seaming the pieces together, and what sort of yarn are you using? When I seam, I don’t knot it off, just leave a tail about 3" or so and thread it through the nearby sts. They don’t come out.
well I use the worsted yarn. I just use a needle and use the same yarn to attach them together. I am a beginner ( been a beginner for a long time 
) then I get to the end and make a knot and do it again and again and then cut it close. :wall: I wish there was a video for that.
I will try what you said. thank you so much
Making a knot is fine, but don’t cut close to it, that’s why it unravels. Knot it, and thread the tail through a few nearby sts then cut.
I meant is the yarn acrylic, cotton, wool… what fiber?
some yarns are more slippy than others. Instead of just tying a knot you may be better of weaving in the tail end which can be very secure ordoing a stop stitch like when you are sewing (doing lots of tiny stitches right on top of one another and one or two harizontally across the knot itself).
Weaving in I have found is the best.
I could have sworn there was a video on weaving in ends… I tried to find it so that I could post a link for you, however, I can’t seem to find it. :??
Anyone out there know where of a good online video that shows how to weave in the ends?
If I find one, I’ll repost.
The video showing weaving in ends may be included in the Mattress stitch video. Just a guess, I don’t remember for sure, but if you’ve seen it here…