I pulled those heavy weights off the ends of the flybar. Let's back up a bit.
After I had the skills needed to control the heli without the heavy flybar weights, I pulled them off. I cut the flybar right where the flybar is bent at the ends to hold those big rubber boots on. Then I went to the hobby shop and got a package with 4 collars with set screws and a set screw wrench. It cost about $2. The collars are 1/16" ID, about 3/16" OD and about 1/4" long.
Anyhow, I put two collars on each end and locked them down tight. You DON'T want them to fly off. Anyhow, with those two collars on each end, you reduce the flybar weight from about 2.6 grams at each end to 1.6 grams at each end. It flies just like stock, but performs noticeably better. I fly with just one collar on each end (.8 gram). I'm not much of a pilot, but it hovers hands off and flies great! No pendulum effect, no TBE.
The secret is getting ALL of the friction out of the flybar pivot points - the linkage at the flybar ball, the linkage at the blade ball, the pivot at the center. Use find sandpaper or a razor knife to scrape all the plastic flash off.

Anyhow, start with two collars on each end. If that works, move one collar on each side about an inch toward the center of the flybar and try that. OK? Move the inner collar a bit more toward the center. If you are still OK, you can take off the second collar and just use one on each end. As I said, I fly mine like that with no problem at all. I fly a stock body with the little cross wing at the tail removed (CX). I've cut the body for ventilation, and added the heat sink, but this is a mostly stock heli. And I get over 10 minutes flight time with my original battery.
I did try to fly with no weight on the flybar. No way. It needs the flybar, but the better you trim the heli the less it needs the weights.
For a cool look, get some 1/4" heat shrink tube and cut it to length so it covers the collar and will reach the edge of the inner ball. Then put a collar on the inboard end next to the link ball on the flybar, and put the other collar at the outboard end. Slip the shink tube over the inner and outer collar (so it covers the collars and the inner shaft) and shrink the whole length of tube. The tube won't shrink tight to the flybar rod, but it will fit tight on the collars and give it a cool look.
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