One way to make an accurate fit between two odd shaped objects is to use scrapers. A very thin layer of color is applied to one object. The two objects are pressed together, transferring a bit of color to the other object where they touch. The color on the second object is removed by scraping, filing or other methods, also removing a tiny bit of material from beneath the color. This is the process known as blue and scrape, which is capable of high precision in metalwork. I used a variation of this process to seat the infills. For color I used carbon soot from a candle flame; the original carbon black.

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Trim the candle for a long wick. It’ll make a long smoky flame. Play that over the casting to leave a layer of soot in the area you’re working.

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Press the infill carefully in place. No wiggling.

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Pull it back out and inspect the contact surface. See the black spots?

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Scrape them off.

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Repeat. It’s a slow and exacting process, but it gets you there.

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