here is a very good, easy to read article on the subject. should be of particular interest to those considering a flat to roller conversion.
https://www.google.ca/url?sa=t&rct=...FhwENj7QMxUixgE7g&sig2=gfuIKO6Hh7kTfyDdGabCHw
https://www.google.ca/url?sa=t&rct=...FhwENj7QMxUixgE7g&sig2=gfuIKO6Hh7kTfyDdGabCHw