Guage glass repair

[Pillow]

Quick and hopefully easy question about Porsche guages and the glass repair.

I see lots of guages on e-bay and stuff where the glass just needs replaced for a nice guage. And the other day I bought a 924 tach with a cone style face glass, wierd.

Anyway what is entailed in popping off the top and replacing the glass?

In my case removing the "cone" and replacing it with a flat glass piece.


Thanks,