hi, I have a 2015 xduro rc fs with an intergrated mount for the hanger for the mech,the screw that attaches to the hanger has became lose and has fell off and I have lost it,would I be able to buy a new hanger ? would the screw come with a new hanger ? also if the bit that the screw fits into is worn can this be fixed ? I contacted chain reaction they say it depends on the frame as to what type of hanger I would need and to contact haibike ?