On Thursday, April 14, 2016 at 11:05:17 AM UTC-7, Jim Wilkins wrote:
"Ed Huntress" wrote in message
...

You may be using the newer, triangular glazing points that have a
little flange on the window side, right?

My windows (and zinc glazing points) are 92 years old. ... The
points are around 3/8" long, on the longest dimension.

I make doors, windows, frames etc out of oak from my sawmill. It takes
considerable force to install the points.

I've had the same problem with my aluminum windows.
I''m not entirely kidding, for thermopane installation, gluing in
some thin wood strips allows putty/points glazing and the results are good.
The glass doesn't bend, the frames are not perfect, a bed of putty
solves all problems.