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Knocking sound


fuse63

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So I have a bulova pocket watch I am working on and it makes a knocking sound only when the watch is dial side up. The mainspring is correct so it's not the strength causing the knocking. The finger guard is good, no cracks on any of the jewels. It's really hard obviously to observe the escapement under my microscope while in dial side up to see what's going on, any tricks would be helpful. 

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I think I figured it out that it is the mainspring because I let down the power andvslowly started winding it and the knocking sound started closer to when it is fully wound. The weird thing is that the amplitude is around 270 when fully wound and I would expect that if the mainspring was too powerful that it would be well into the 300's

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