Regarding freewheels in general, they can be screwed on pretty tight, since the pedaling action tightens the mounting screw onto the hub. The bench vise method works best since you have a pretty good lever arm (the wheel) to break the joint free. (Some people liken it to a bus driver making a turn.) But if you don't have a bench vise, leave the inflated tire on the bike. Then place wheel vertical on the ground. Position your self over the wheel and use a long wrench (in the horizontal position) and use your weight to unscrew the freewheel. It's a great feeling when it breaks loose. And always a good idea to use the skewer or axle nut to loosely retain the tool into the splines. When re-installing grease the threads.