hi,i had a similar problem a couple of weeks ago.i took it to the shop
and the flybar had kind of twisted in its housing(sorry,dont know tech
names yet)he told me that the flybar and the top blades should be all
floppy and move easily when you tap the flybar.he also told me its worth
looking inside the holes on the top blades just to check there isnt a burr
of plastic causing them to stick.hope this helps.
crap weather this weekend,typically english.the only thing thats
gauranteed is i wont have to visit the model shop tomorrow for more
spares for my pred.
steve