I have a 26cc “Zenoah copy” - a QJ engine brand new never run.

I noticed after installing it on a test bench and securing the prop, that when I turn it the front end of the prop shaft seems to wobble off center.
I’d say the wobble is about 1/16”.

This is my first gas engine and I have no idea if this is common or how critical is it.

I have about 45 years experience with glow engines and have never come across this kind of thing.

Would appreciate advice from the more experienced...
TIA