i have worked around hose for 20 plus years, my suggestion is on the end where the hose was cut there are 2 little wires you will see take a pair of pliers or vise grips pull enough of the wire out that the what i am calling a cuff becomes soft you can pull enough out that the stem you are want to insert can be inserted all the way end. once you may or maynot need to pull the second wire. But pull enough to insert the stem them cut the wire you are pulling with a pair of wire cutters. use one or two worm gear
clamps this should solve the delima you are suffering from hard wall hose.