Well, I have finished writing a new non-Harry fairy tale, but I have to wait for some strong sunshine to take the photos. Maybe tomorrow, if the weather cooperates.
In the meantime, I have a solution to a problem that has plagued me and like-minded footie folks since first the wad of algae crawled out of the primeval slime onto a snowbank and immediately began knitting warm socks for its pseudopodia.
The solution turned out to be so simple I whacked myself upside the head. So will you, after you finish reading this post.
This solution applies to my own Fleegle sock design, (worked on two circulars) but I imagine it can be applied to any heel that is knit back and forth, such as a short-row heel. I don't think the trick, if you can call it that, can be used for flap heels, but perhaps someone might be able to adapt the concept.
Basically, the reason you get holes when connecting the heel to the instep is because (in the case of the Fleegle sock) the completed heel is one row taller than the instep. So the solution is to omit the final turn for this type of heel. I shall demonstrate.
I start by knitting across the heel needle 2 stitches past the center stitch, then K2tog, K1, turn, and slip the first stitch. Then I purl back to 2 stitches past the center again, P2 tog tbl, P1, turn, slip 1. Now I knit to the gap, knit the stitches before and after the gap together, K1, turn, slip 1 etc etc. [I actually don't turn and purl back. I knit backwards. Easier, I think.]
And here's a picture of the almost-completed heel. I have one more row to finish.There are 2 stitches on each side that have not been incorporated into the heel.
If, at this point, I knit across the heel needle and do the K2tog, K1, turn, slip 1 thing, well, the heel will be one row taller than the instep, so after I finish the purl side decrease and knit back, hello, there will be a gap waiting to be filled by picking up stitches between the heel and the instep needle.
So, instead of turning, I finish the last row of the knit side with K2 together, K1, and then continue on to the instep needle.
Look! No hole!
In the center, you can see five stitches of the instep needle worked.
I knit across the instep needle, then, when I get back around to the heel needle, I begin with a K1, K2 Together/Left Slant. (I knit in the front of the first stitch and the back of the second stitch to slant a decrease to the left, but you can use any other variation that pleases you.)
In the case of the Fleegle heel, there are two more stitches on the heel needle than I started with, so I knit across to the end of the heel needle, do a decrease, knit across the instep needle, and do a counterpart decrease at the beginning of the heel needle.
And I am now ready to motor onwards to the top of the sock without bringing any holes with me. Here's a picture of the finished heel as we proceed onwards and upwards to the finish line.
Whack! Whack! Whack!