Tips for accepting commissions
Moderator: Brad Walker
a stop is just a small piece of something. it is most frequently wood or metal, but could be anything else that is solid enough to drill and will hold. it's drilled or nailed and serves to hold something back. it can be just a small 1" piece, or a full length piece, of moulding, depending upon what you want it to look like. this is woodworking or carpentry, not glass, that you're getting into.
Your "stop" should match the material you are setting into... so if you have a metal-framed window, you would choose a metal stop in a matching color. If you have white wood window frames, you would get wood quarter-round to paint white and cut into stops. Quarter-round is just a fat dowel that has been cut into four pieces of wood length-wise so that it's literally a quarter of the round dowel... does that make sense? These kinds of stops are a very neat fit. You put your art panel up against the existing glazing propped on the wood frame, then place a wood stop over the lead borders and nail into the window frame to hold the art panel in place next to the window glass. When you're finished the art glass is securely held in place, but the stops you use blend in and look like part of the original window frame. It's easy, really. 

Thank you for your reply.... I'm wondering, are there any advantages to having a space, a pocket of air between the original window and a glass piece being installed? Putting a spacer between the original window and the work, and then the outside spacer designed to keep the work in place?
Just wondering,
Susan
Just wondering,
Susan