Hey Regis, to answer your question regarding "should a machine be able to sew anything that will fit under the foot". The answer is no, not correctly or feasable anyway. Lets say that the foot will lift 1/2", which the Class 18, 618, 1541 all will, doesn't mean that the machine will sew 1/2". The problem lies with the thread. To sew 1/2" skirting leather, or holster or sheaths, you will need a 277 thread and a # 24 or #25 needle, and these machines are not designed to do this. Yes they will sew chap leather, but who sews 1/2" chap leather? Your best bet is to realize that the machines will do what they are designed to do very well, but as soon as you start thinking that they may do more is when you start to get into trouble. Keep it simple... limit what you sew on these machines to 3/8" of anything, with a 138 on top, (207 maximum), on top, and 138 in the bobbin with a # 22,
(#23 maximum), needle, and you will be fine. If you want to sew heavier than this, then it is time to jump to the Class 3 or Class 4 style machines. THanks, Steve