Nope Al,, I am talking about the "L" shaped ones like Stuart used in my #9 Mill engine. Those would be trickey to keep in position considering the small size of our model engines. Much easier to mill slots and drill from the end of the cylinder to the slots. Jesse in cool dry West Tennessee Jesse, are you referring to the method that uses a built-up valve face? Al Messer 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.