Hold on a second!! That yoke is perfectly fit! I was taught to fit the yoke button so that when opening the cylinder the yoke would have some tightness at full opening so that it would remain in position while reloading. Go back to the time when the yoke had a pin inset into the yoke and an indent in the frame so that it held open for reloading. Same thing. With the new spring loaded yoke screws, this concept evaporated.
Who ever fit that yoke/screw knew what he was doing!

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Richard Gillespie
FBINA 102