Rebedding deadlight - spacer?

[WinterRiver]

One of my fall projects is rebedding the deadlights.

Inside, there is some (now crumbling) spacer material that was used to make the glass flush with the hull on the exterior. It's about 1/4" thick along the bottom, tapering to about 1/8" along the top.

Does anyone have any recommendations for replacement spacers?

[sailingdog]

was the material a gasket for the deadlight? If so, you might be able to use neoprene as a material for the spacer.

[WinterRiver]

It's simply acting as a spacer. The seal is on the outside, with a ring around the glass. Neoprene may work, since it's easy to cut and won't compress. Thanks.

[sailingdog]

Neoprene does compress. It's a form of foam rubber. If you need a solid spacer, use starboard or PVC