727 Front Seal

I sometimes use a sharp awl to knock tiny a hole in the seal the screw a drywall screw in it and pull the screw. If you know there is a solid stop shoulder behind the seal you can run the screw in and it'll jack the seal out.
If the old seal isn't damaged too bad it can be turned backward and used with a socket or piece of pipe as a knocker for installing the new seal.