can anyone tell me what it is about mini crankers that make them so much better for lining as apposed to any other top notch rotary? i hear a lot of praise for these machines for the use of lining but just don't know what it is that sets them apart, since i don't own one. ive just bought so many machines that i don't like, or i do like but never seen this vast improvement that people speak of.(with a few exceptions). i know quality plays a part and stroke, and motor, etc. but what is the singular thing that puts a cranker a step above? thanks.