Has anyone successfully done this conversion? My 145 bobbin case is completely worn out to the point of binding up my machine. Since I have to replace it I figured this would be the time to convert to the bigger bobbin setup. I ordered the 545 bobbin case, cap, base and the opener arm thing. Will I need a 545 saddle that it rides on also? I'm not sure where I would even find that. I may have a new 545 bobbin case for sale cheap in the near future.