So I thought I might take out the QTR vent window to clean it up, (even though the glue hasnt arrived yet)
The 1st pic is a spare frame I have, and the QTR vent frame is retained by a collar with a roll pin
with the frame out, this is easy enough to punch out, but with the frame still in the door, access to the pin is restricted.
presumbaly there is no alternative but to punch the pin out from the inside of the door & somehow trap it from dropping down into the door ?
edit; answer is yes…I eased a small magnet up behind to stop the pin falling down