<html><head></head><body><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1492567889675_2272"> Cliff & Alec,</div><div id="yui_3_16_0_ym19_1_1492567889675_2271">just ordering 20 tempered borosilicate lenses at $2-50 each including postage!</div><div id="yui_3_16_0_ym19_1_1492567889675_2305">They will go in the pressure chamber, so I'll know whether I got good value.</div><div id="yui_3_16_0_ym19_1_1492567889675_2325">Just wondering what you guys used as gaskets under the lens.</div><div id="yui_3_16_0_ym19_1_1492567889675_2324">I did have an o-ring under the acrylic lens but are putting a gasket under the glass.</div><div id="yui_3_16_0_ym19_1_1492567889675_2342">I have an o-ring in the bore of the lens housing but would like my gasket to be a </div><div id="yui_3_16_0_ym19_1_1492567889675_2417" dir="ltr">secondary seal as well as seat.</div><div id="yui_3_16_0_ym19_1_1492567889675_2416" dir="ltr">Alec, with your experience of lenses breaking, I am looking at a suitable thickness</div><div id="yui_3_16_0_ym19_1_1492567889675_2415" dir="ltr">of neoprene or similar for the top gasket that I can compress to half it's thickness </div><div id="yui_3_16_0_ym19_1_1492567889675_2434" dir="ltr">when bolting the housing together. This will give me a bit of machining tolerance.</div><div id="yui_3_16_0_ym19_1_1492567889675_2465" dir="ltr">see attachment</div><div id="yui_3_16_0_ym19_1_1492567889675_2448" dir="ltr">Alan</div></div></body></html>