dunster,
Yes, a true long arm is 18", mid-arms are 15-17". Right now I only have various DSM's and realize the difference in throat space severely limits what I can do on any frame.
Finances are very limited in this household (hubby's heart transplant medical bills take priority

).
I'm just exploring options at this time - hoping a mid-arm or longarm machine comes my way without a frame.
Shari