I am replacing both door windows on my 58 Skyliner. I have put the new glass into the frame with setting tape but have not been able to get the glass into the lift channel with a new seal in them. I have used a rubber hammer gently with no results. Is there a tricky way to seat the glass into the seal in the lift channel? If it can not be done by an amateur, where would anyone suggest I take the windows to be assembled.

Dale