Missing Bolt in Viking Harrier fold-up Ebike

ETownsend

Just Joined
Feb 11, 2021
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(apologies if this is in the wrong area)
Hiya, I hope you wonderful people can help me!
My sister purchased a second-hand ebike (viking Harrier Foldup E-bike) and was fine for a couple of weeks now all of a sudden the Stem is just constantly turning out of sync with the wheel upon further investigation, a bolt is missing in the stem where it attaches to the folding mechanism (or hinge I suppose?). Would it possible if anyone knows what the size of bolt this is? Thank you in advance!
 

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