Gly Flewfirst made that machine for me with some of his handmade coils 10wrap with 47 cap. I did not like how it ran at all so i happen to get those quad cores from eddy munster for free. Those are actually the handmade ones thoe you can get production ones for around 75. I turned the machine into a liner and changed the back spring.It runs so smooth(purrs) now and can push almost any size needle-has a long power curve and is a bit quieter. I can even do small contouring and shading with it.