Question regarding pushers on UG Compur

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I recently had my Compur serviced but my watchmaker is having difficulty securing one of the pushers in the case. Apparently it keeps falling off. There was no issue with the pushers prior to servicing. Any trick with these that my watchmaker may not know about?
 
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The holding screw is too short or not tight enough ?
 
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The holding screw is too short or not tight enough ?

+1 probably the explanation !
 
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The holding screw is too short or not tight enough ?
Any other likely causes? I’d like to hand him a troubleshooting checklist 😉
 
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I don't think so. Maybe the pusher itself is not correctly fixed to the pusher stem ?
 
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I think your two pushers are different. The top one is ok, the lower not is different and too small 👎 but that’s only my point of view...
 
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I think your two pushers are different. The top one is ok, the lower not is different and too small 👎 but that’s only my point of view...
They are absolutely identical:5,2 mm.😀