I know that the bore of a steam cylinder should be both round and parallel, but should the interior finish also be "mirror bright" or should we strive for the "cross-hatched pattern" of the internal combustion engine cylinder? Al Messer, confused in rainy Mid- Tenn. __________________________________ Do you Yahoo!? Yahoo! Mail Address AutoComplete - You start. We finish. http://promotions.yahoo.com/new_mail MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.