I have just tried to fit an Ettore rubber into a Sorbo channel. Unfortunately much too tight to slide along.
What we done was wet the squeegee rubber with soapy water.
Yes it was a tight fit.
We used a pointy nose pliers to pull the squeegee rubber through.
Hi H Man, I did lubricate with soap and used pliers but was much too tight.
Maybe the Wagtail rubber you used has a slimmer profile..
Oh, and enjoy the cricket this afternoon.