This should be an easy to find wrecking yard item. If you want to see yours, open your vent and, with a torch driver, loosen the locking handle. The piece in question goes directly against the glass inside the hole that's drilled in the glass. It's perhaps a half inch wide and is tapered a bit, IIRC. 

Karl Wolz
Sent from my electronic umbilicus

> On Apr 27, 2016, at 3:39 AM, William Monk <billmonk@gmail.com> wrote:
> 
> Does anyone have a picture of this piece? Lead is a very soft material to work with. Deal with it at work sometimes and use it making sinkers every couple years. 
> 
> Bill M
> 
> Sent from my iPhone
> 
>> On Apr 26, 2016, at 10:55 PM, Karl Wolz <wolzphoto@Q.COM> wrote:
>> 
>> Ken, the latch that keeps the vent closed is held by a screw that fastens through a lead piece. It is perhaps a half inch wide and is conical. I believe it is lead to absorb impacts and keep the vent from shattering. 
>> 
>> Karl Wolz
>> Sent from my electronic umbilicus
>> 
>>> On Apr 26, 2016, at 4:10 PM, kenneth wilford (Van-Again) <kenwilfy@COMCAST.NET> wrote:
>>> 
>>> scratching