P3D Green mounts

["Kenneth Luker" <kluker@xxxxxxxxxxxxxxxx>]

> >Anyone know of a source for the older style heat seal mounts with
> >the dark green interior, as opposed to the ones that are currently
> >available with the light blue? Please contact me off list.
> >(Reel 3d just has the newer ones now). 
> 
> Last time I checked (about a year ago), Dalia had them. 
> Any reason for the green preference?

I suspect the makers of the blue mounts and the green 
mounts are the same--they just changed the glue.  I liked 
dark green because they seemed more opaque.  But then 
I found that both green and blue heat-seal mounts were 
susceptible to quality control problems:  the bottom edge 
of the cutout, and therefore of the window, was not exactly 
parallel to the bottom edge of the mount, so the mounted 
pair was viewed or projected with a slight rotational 
displacement of the window (one window edge was lower 
than the other)  That could be fixed in projection by 
adjusting the vertical, but in a viewer it was uncomfortable. 
And projection using more than one batch of mounts 
required repeated adjustment.  

I'd been using heat-seals for years, but when I became 
sensitive to the difference between average mounting and 
precision mounting, I found the deteriorating quality 
control in successive batches of heat-seal purchases was 
not tolerable.  I switched to Spicer mounts, exchanged 
my clothes-iron sealer for a bottle of Elmer's glue, and 
have been happy ever since.   (Lots faster, too!)

Ken Luker
_______________________________________________________________
Kenneth Luker
Marriott Library Administration
KLUKER@xxxxxxxxxxxxxxxx