So, I was thinking about my wheel... and the whorl, bobbin and flyer area. I still need to position my maidens to face the drive wheel, fit a band and maybe oil it, not that it seems squeaky or not moving smoothly... but is the whorl supposed to come off the rod that holds it and the bobbin? I haven't tried to take to off but I'm assuming you must have to switch out bobbins for some reason, right? Silly newbie question but you don't know if you don't ask. Thank you in advance!