Slow runner - loose cannon pinion?

[Bonefixer]

Just restored an old chronograph. Started as a completely gunked up non-runner and now works well. On the timegrapher it’s got good amplitude, low beat error and loses a few seconds a day. The hands lose time, but when I time the sub-second and the chronograph it’s accurate. 
 

Loose cannon pinion? Could it be anything else, and how do I confirm before tightening it up (something I’ve not done before)

[nevenbekriev]

Sounds like it is really loose cannon pinion. Hands setting without resistance? Just tighten it and will be OK.

[Mercurial]

If the watch is losing roughly the same amount of time every hour through the day, then it is likely that the fault is not the cannon pinion. 

You said that the watch runs well on the timegrapher, but is it running well across positions? Are the rates in the dial positions similar to the rates in the vertical positions?

If the watch is losing time in an unpredictable fashion, as would happen if the hands are slipping, then the cannon pinion is more likely to be the culprit.

One way to test if a loose cannon pinion is causing the problem is to put a hair through it before installing it. The hair will temporarily tighten it. 

If the hair solves the problem, you can remove it and tighten the cannon pinion for a more durable repair. 

Best Regards,

Mark

[Bonefixer]

It was the cannon pinion. Further testing I realised that there was very little resistance when hand setting, so I swapped it for one from another Landeron 48 I’m working on. And now it seems to be keeping time, no slipping.