if you are saying that the FR-1 fits but the force applied is inadequate. use more force.
i use SS freewheels on many of my bikes, and i don't even mess around with them. the removal tool goes on, followed by a 10 inch adjustable wrench, and then a 2.5 foot piece of scrap drilling pipe over the wrench handle. they ALL come off. tire on ground, braced veritcally with shoulder and left hand, mild pressure on end of pipe and it's loose.
resistance is futile.
as a matter of fact, when i see that old crusty freewheel in your pic i
want, really
want, to remove it.