Syma Forum

Having broken the mount for the balance bar on the christmas tree on my 107g, I ordered a replacement inner shaft and tree.  On attempting to fit the new tree, I can't get it to actually fit back together.  I have used SN's great video which was a great help, but the problem seems to be that on the original top, the drive pins for the top rotor, and the set screws to retain the top to the shaft appear to be offset by about 45 degrees.  The replacement top has them in the same plane, ie. parallell to each other.  When attempting to put the balance bar back on, the dog bones won't go on, as now they seem to be too long.  I can get 1 only on, and the balance bar then sits at an angle, making fitting the other dog bone impossible.  The only difference I can find is in the whole "christmas tree" part, where the drive pins for the rotors and the set screw to attach to the shaft are at 45 degrees to the other as described above.  Do i have the right parts?  Or has there been a design change?  Or am I just too dumb to have one of these?    Any ideas?  Edit,   I just noticed that the distance between the drive pins and the set screw for the shaft are also further apart on the old top.  That would make the dog bones too long too.  Do I have an incorrect part then?