<html><head></head><body><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:13px"><div id="yui_3_16_0_ym19_1_1498859236801_5335">Hi Sean,</div><div id="yui_3_16_0_ym19_1_1498859236801_5335" dir="ltr">I just heard back from EE with a cost for two 36 inch id 3.5 inch heads, and they can not do 1% Diameter sphericity. They can do ASME code witch is 1.25% or 5\8 inch. I suppose that would mean machining the heads. The heads could be machined to a very close tolerance then. I would have to build a turret lathe then.</div><div id="yui_3_16_0_ym19_1_1498859236801_5335" dir="ltr">Hank</div></div></body></html>