Here’s another hint from an In The Loop knitter – Thanks, Mary. Very clever!
“In addition to Heather’s great tips, there is another way, which I like best, for a seamless join when knitting in the round but works only with long tail cast-on. When ready to join, insert right needle into back of first stitch on left needle and pull the tail all the way through, leaving the first stitch on the left needle. Give it a little tug to bring your circle together then knit in the front of the first stitch with the working yarn as usual. When you’ve knit around to this spot again, flip the tail to the back of the work and forget about it ‘till it is time to weave it in. Try it, you’ll like it.”
Mary K