I agree with alan there should be a thrust washer to provide a small gap between the hub and case.
the prop should swing freely with the glow plug removed and no contact between the prop hub and the case, if its new go to the place you bought it from and ask for help.
check all your parts,not to big on TT engines but there should be a exploded view make sure you have all parts in there right place before you alter or heat any parts.
BTW you shouldn't have to do anything like that anyway not good advice.
on a new engine if its not perfect out of the box its not right return it for a new one or refund.you shouldn't have to force it to flip over a new engine is tight to flip not stuck something is wrong or missing.