Mr. Bright of Bright&Clara'sChannel has mentioned this in several of his videos. Reach out to him and ask him how his steel benders deal with this situation. Mr. Bright is very generous with his advice plus helping the diasporans and his people in Ghana.
Not really, no solution. So you have to make sure if your project needs 12mm then u should buy 14 rather, if it need 14mm then buy 16mm rather. That’s the only thing that can help your building otherwise you might cause a serious damage to your structure.