Video to assembling the Prelude put out by Kromski North America: https://www.youtube.com/watch?v=m8sKuRYWVX0
I love Kromski wheels! I have a Sonata that is my main go-to wheel. It is a single drive, Scotch tension (flyer driven) like the Prelude and has the elastic drive band and a brake band, also like the Prelude. The Sonata is an upright or castle style wheel instead of a saxony style wheel though.
You may be having trouble with both your drive band and your brake band. For your drive band, you only want it tight enough so that the main wheel and the flyer to move without any slipping when you start treadling. (It is a lot more loose than you think it needs to be!) Check out this “Tim Talk” https://www.youtube.com/watch?v=ttSES-5Ve74
Likewise tensioning the bobbin is the same. Increase the tension by 1/8 to 1/4 turns of the tensioning knob until the yarn catches. Make sure your leader/yarn is threaded through the orifice correctly and not caught up on or twisted around the hooks.
There is a technique used when learning how to drop spindle where you build up the twist in a leader then quit spindling and allow the twist to come up the drafted fiber, then wrap the fiber on to the bobbin. You can use this same technique at the spinning wheel. Treadle your wheel allowing some twist to build up. Quit treadling and allow the twist to come up into the fiber. Start treadling again pulling the yarn onto the bobbin.
(Also check out spinning wheel maintenance part 1! https://www.youtube.com/watch?v=LHN3o6aRzN0)
When I’m teaching a new spinner on a wheel, I spend a good amount of time with the treadle. Treadling is like a waltz, slow and steady. I like to see the spinner be able to stop the wheel and reverse directions with their feet (on purpose!) It’s not necessary but it sure builds up confidence.
Next, I have them pull some acrylic yarn threw the orifice backwards and tie it on the bobbin. This teaches them about tensioning and not to hold the yarn (fiber) so tightly that it doesn’t go on the bobbin (one of the most common mistakes!) After a few bobbins of acrylic yarn, then we attach some fiber and start spinning real yarn.
I hope these can help you. If you need more advice, please tag me (use the @ and mullerslanefarm so I get a notification)
(And @salmonmac, I’m no master … I’m just what you have but I thank you for the complement! )