@jaynik not sure what bar bent for you...there should be any issue with parts bending during removal..bc you are replacing with new ash sweep.
regarding installing new modded ash sweep..did you file both sides of the ash sweep holes where the vent control bar inserts...both holes need to be filed and if you have problems inserting..ensure you have the vent bar properly aligned when inserting.
there is a small male notch on the vent bar...mate correctly with the holes.
if you did all the above and still have assembly problems...file the hole bigger vertically...
ive modded several with no issues