Maybe I should add that I don't have a table saw. I have a jigsaw and might buy a hand router. I could roughly cut a wider piece with the jigsaw and then smooth it with a routing (using a straight piece as a template).
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· Västra Götalands Län
· 529 posts
In the lumber section, buy planed timber. Available in various dimensions, buy the nearest larger one you can find, e.g., 70 mm x 28 mm. Draw a line at 50 mm, cut with a jigsaw as straight as you can. (Or use a rip saw, but I assumed you didn't have one). This is the side AGAINST the frame. Soften the visible edge with a small plane + sandpaper, or just sandpaper. Cut and install. Seal with latex or wood filler against the frame where you failed with the sawing. Prime, paint. Done.
A real construction store splits them for you at a small cost. Done in a jiffy!
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