You are officially banned for life from the pinball club manitouguy.
Ha ha ha ha ha Just kidding
Yea, I'm with Pinman that any mod is doable as long as it's reversible. If I ever sell a pin that had a custom mod I've done then I'd remove it first before market. Like Dirt Flipper said, first remove any previous owner mods before troubleshooting.
That original PF looks pretty good to me, in your pics. That's going to be a nice machine for you manitouguy.