Most people would use the needle that is recommended,if your machine has been re-timed it's just a matter of adjusting the needlebar to use the correct needles that you have.You just take the needle plate off & turn the machine around until the point of the hook is @ the needle & the eye needs to be approx. 1/8" below the hook point.If it needs to be adjusted,open the faceplate,locate the screw on the needlebar clamp ,loosen it & raise or lower as needed.When reinstalling the needle plate be sure the small metal tab on the bobbincase is in the groove of the needle plate before you tighten the screws.