'Gas saver' for 9 and 29 series

[performance]

I received some information that the "pyrex" lenses are just cut up test tube material. hmmmm.......

[rick9345]

Quartz, works fine,real fun to cut to length need good diamond impregnated wheel,not glued to steel back stuff. The dust

[BillC]

I received some information that the "pyrex" lenses are just cut up test tube material. hmmmm.......

Nope, test tubes are not a third the thickness of these Pyrex lenses.