Suitcase, I have used a weighted prop nut on my OS FX 46 on my Bipe. I actually bought a 1 oz prop washer for my twister and it pretty much did the trick. The usually come in 1/2 oz to 2 oz weight, prop nut or washer. I had to move the throttle push rod over a little more to remove the bind I had. That meant drilling a new hole and plugging the old one. I used a chinese chopstick to fill the hole.
Can't even tell the hole was there.

Frank