Rubber flippin rein stoppers!

Are the reins rubber all the way to the buckle at the bit? If not, put them on from that end. Or do what Bettyboo222 said, never tried that method.
 
Put them ni hot water, and use 2 loops of baler twine.

One loop through the stopper and stand on the other end, and put the other piece through the stopper and hook on a door handle (loops need to be short enough so that you can then put your foot down and stretch the rubber)
 
Top