if you are getting too much twist in your yarn its because the yarn is not taking up fast enough so you can do several things. Spin thinner, and slow the wheel down. Check and make sure that your yarn is not catching on the flyer hooks. Correct adjustment of a spinning wheel--any wheel is only enough tension so that you can pull the yarn out from the flyer with ease, and have it rewind onto the bobbin during treadling. Check that the drive band will drive the drive wheel with ease, but not be so tight that it is hard to treadle. Some bounce is desirable in the drive band. Correct oiling and greasing of all friction parts as needed. On some wheels take up will cease when the bobbin is so full, and the only option is to either change the bobbin or empty the bobbin and start over. Over filling of a bobbin will also stop winding on, and I am just as guilty of that as anyone. Another problem that happens is that the flyer shaft becomes sticky and it causes friction on the bobbin. Solution for this is Vaseline or a light bearing grease. I prefer the light bearing grease, but you must always be mindful of the deposits and clean the shaft each time the bobbin is changed then re-grease. Bearings can effect flyer performance just as well. On a lot of wheels the bearing that the flyer rests in are nylon and oil is not an option for them. You need to use a silicone made for nylon. Oil on nylon bearings will wear them out--they just slowly disappear with wear. On leather bearings oil is perfectly fine, but use light oil, and not neat's-foot oil, or use mink oil (preferred) as leather will harden if not tended regularly. Do not over oil, leather will become soft and floppy if over oiled. Of course most leather bearings are really thick, so it doesn't hurt them, but I have seen some, especially on old walking wheels that were thin.