Cab door window glass referb - Now window wont lower

[scull]

Hi guys and girls. Ive just referbed my driver cab door windows by installing new window scrapers with trims both inner and outer and new felt channels as mine were rotten. What a bastard of a job that was. Probably the most frustrating job I have done on my bus after +25 years of its ownership! Cab doors look nice and fresh now but the new felt channel runners inserted around the doors are grabbing my window so tight the glass keeps pulling out bottom grab channel (with rubber insert) every time I try to wind the window back down!! My initial thoughts for a remedy was to drill x2 6mm dia holes in the bottom runner and through window glass to mechanically fix the window in the channel using plastic number plate bolts and nuts but that idea was tempered (no pun intended) due to the high risk of shattering the glass using a 6mm dia tile drill or hollow diamond lased hole drill at around 6mm dia. I guess that if I use very gentle pressure on the drill perhaps with some water cooling applied by a glamourous assistant (wifey) as I am drilling through the window may work but Im wondering if any member here has a better idea that may just save my window from shattering but secure it better in the lower winder channel when winding the window down. Im looking forward to your hearing your thoughts. Many thanks in advance. Scull.