When I mock the receiver up the sears bind on the HOT mechanism. David gave me some great info concerning the three screws but in this case I not sure I have the right sears.
Summary: The sears foot (trigger side) size (.547) seem be correct for Regular frame but binds when using Hunter-One Trigger (HOT). I tried using a FW sears, which measure .521, and they also bind.
Question: What is the size of the sear foot on a HOT equipped gun?
1) The Left sear foot touches the actual mechanism and does not clear the selective lever therefore trigger would fire the left barrel even if the selector is set to fire the right barrel first.
2) The right sear foot binds the actual mechanism before the side plate is fully drawn in.