[sportygreg]

If you were able to center tail slider and have equal travel in both directions and gyro is working properly then there must be something else wrong.Tail gear housing should be perpendicular and not angled-belt could be too loose or gear slipping on shaft causing tail rotor to lose power.Turn rotor while holding tail [not too hard!] and see if there is any slippage.If your tail housing is changing position it may be too loose and allowing too much slack.It's a good idea to practice on a smooth surface and not get snagged on carpeting.There is also the possibility that something is binding-tail servo rod may be twisted or slider and tail blade holders not moving freely-you could disconnect tail servo rod and operate slider manually to see if that's the case.Gyro should be firmly mounted and straight with no other wires close to it that could cause interference.These are all the possible things I can think of.