In the “Single Outline Diamond with beads” video, near the end, I demonstrate . . .
WHAT TO DO WHEN THE WEAVING GETS TIGHT AT THE TOP
The first thing to do is use your thumb to press down on the threads when there’s not enough room for the Tug technique (see My First Video). Next you can use your fork; if your fork doesn’t have a straight edge at the end of the handle, you can use the side of the tines.
When you’ve hit the frame and nothing else will do, you can use a crochet hook. I use an Amour by Clover, size B (2.25 mm) because it fits through the pins (sometimes I have to use the hook to rewarp parts of the loom that inadvertently “gang aft agley”) and it’s not useful for most of my crocheting.
These techniques are demonstrated in this video. Go to 5:40 on the clock.