At 03:22 AM 3/10/2013, you wrote: >ensure that the lens is blown rather than flat wrapped and reliant on the >attachment screws for maintaining the curvature. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A lens can be formed over a mold of the lead edge covered in felt, then placed in your kitchen oven at low heat. When it starts to droop, remove from oven, and with a pair of soft gloves, pull down to conform to the mold. I can't imagine what the defect was in the lens in the reported accident to cause it to split exactly down the middle. Larry Flesner
