I acually solved it by remaking the whole but before making the hole i made a copy of the cylinder and then when the hole was made i just moved it it and ofc it fits perfectly.. now my problem is that i got 7 corners in 1 of the faces https://i44.tinypic.com/15dw4zp.png i've marked the 7 vertexes, will this be a problem later on or is it alright? can i change it somehow?