Re: sand blasting 31 roadster, took of tack rail
I’ve not seen factory photo of assembly.
My guess (based on experience was the front “lips”‘we’re folded after the tack material was placed inside the metal housing. The original was not wood but a twisted product similar to a tough jute or very tightly twisted paper.
I’ve used upholstery backer board cut in strips and glued in layers in the channel
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