That's how we do it to...it's always more accurate to scribe than measure. alot of guys i know mark from the underside of their cap but that is awkward. doing it as described above we move around both sides of the radius (especially when it's a circle) at the same time
This is hard to explain without a pic but we set the cap on the radius with the overhang we like, then make sure that both of the back corners of the cap are equal distance from the row of blocks it's sitting on. we maintain that distance all through the radius so that from the top veiw you end up with a smooth looking curve in your caps . Generally we have one full cap then a cut cap then a full cap ect. On tighter radius we sometimes have to shorten the full cap (depending on block) so that you can maintain the correct overhang. (very hard to understand without pictures , i know)
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