Hello John, perhaps there is something inside the "whisker" that is scratching the glass as it's wound up and down. It's strange it's in the same position on both sides. I read somewhere that if either the wrong clips were used or fitted incorrectly this could cause scratching. Do you think the whiskers and trim may have been removed and refitted in the past? Perhaps you should check before fitting the new glass
You may have already bought new glass, but i'm an advocate of restoring and conserving where possible, if you have original glass it's a shame to change it, if the scratches are fine and superficial, have you considered trying to polish them out with a compound? there are several on the market and plenty of videos, and even companies who will do it for you, but i don't have any experience of how successful it is, just a thought
