passenger window coming off its runner!

[wacker315]

right finally had a bit of time to do the window. i managed to get the old clip out but i cannot get the new 1 in the seals properly. i popped it through the hole in the glass first and then tried to get the window to sit in the seal but no luck. am just wondering if any1 has removed the inside seal of the window to help do this. this is doing my head in!