Originally Posted by
B19 JUB
you dont have to take arch liner out.take the 8mm bolt out and there will be two grooves.its like a flap they never made properly.score with a knife and pull back the flap and the point is right there

on both the arches i used, there was no score line, normal and st
and neither was there enough give in the plastic to be able to move it out of the way enough
so now i've cut a big section out and then another to fit over the top of it