Difficulty in reinserting IGU into vinyl sash frame
 

The sash inside cavity has a ribbed seal on both sides; ribbed seal is glued
inside the frame. The friction between ribs and new glass is significant.
Lubrication does not improve the ease of insertion of IGU. Vinyl frame sides
are not separable. Any suggestions on easing the installation of IGU in the
vinyl sash frame without cracking glass? Yes, we cracked one new pane. I am
repairing 6 sashes. We are considering removing the glued ribbed seal on one
side; then caulk between the glass pane and vinyl frame.

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