Just be sure to use red Loctite on the screws when you reinstall them. You don't want one shaking loose and getting imbedded in the top of a piston! Did you drill or grind away the riveted part of the screws on the opposite side from the head before trying to remove them? They're not usually removed during a rebuild unless the shaft and/or bushings in the housing are being replaced.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!