Changing the wagtail Rubber

I for the first time after I have been using my wagtail, I had to change the rubber which came already installed on the unit.
It came out with no problem, but when I tried to insert a new rubber it would only go half way as there is a notch in the middle stopping the rubber from being inserted all the way. No matter how hard I tried to get it pass the middle notch it would not budge. Any suggestions?

I would try using a flathead screwdriver and bending the channel up slightly. Mywagga, on youtube, explains how to do this.

You can also get it a bit wet with some soapy water. It will slide in way easier.

I agree with Chris. I just get it a little wet and it goes in easy.