hello, np there are dial circuits, since almost all of them are different, you must arm yourself with patience and try, with some attempts you will achieve it without a doubt, it is sure that you will need a spring that goes on the pulley to keep it tense More complicated part is working, you just have to run the needle, it is quite easy, place the needle in a known station, then place the tandem in the place that tuned said station, then you pass the thread through the pulleys securing it in the tandem, you must Verify that the dial runs in the same direction as the tandem, greetings.