Second hand kickback

[Gra]

I bought this Elco as a donor for a Helvetia 837, decided later that I would have to rebuild it as it has such a beautiful dial.

Having rebuilt it I find that I am getting a kickback on the second hand when winding the hand backwards, I have looked over twice but can not figure out what I must have got wrong. Anyone any ideas?

[AshF]

Cannon pinion too tight?  Does it feel stiff to set the time?  Check the wear on the train wheels, possibly the 4th wheel to the escape, if there is a lot of play between those two then the slack will be transmitted to the center seconds pinion (or whichever wheel drives the seconds pinion in that movement).

[watchweasol]

Hi sounds very much as AshF said you have got some wear either the jewel/bearing or the wheels.

[Gra]

Thank AshF & Ww, the hands move quite freely so doesn’t look like the cannon pinion, I’ll open it up this week and check for play in the wheels, hopefully it is a wheel, the3rd & 4th wheel for example are stocked by Cousins, if it’s a jewel then it’s too technical for me.

The movement by the way is a H837, according to the serial number it’s dated 1953.

Graham