Hi, I actually found these items quite usefull...
Initially I found this cutter not as acurate as I wanted for thick single cuts because of how the blade slices but it has helped with my latest 1/700 repetetive cuts of harbour supports. Perhaps I'm lucky as the cutting matt for mine sits slightly proud of the steel frame so the alighning plates function.
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No problem with this with no paint creeping. I either cover the other appertures with masking tape or cut the individual circles out to make single templates for easier handling. Used as a scribing template for smaller circles as well.
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The Olafs been handy with large circles used the way
Simon described if you don't expect immediate cuts.
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Now these are items that I have used once or not used in a while and perhaps not at all...
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I still use a tooth pick or a brush to pick up paint or stir...
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Specially bought to cut rigging for my USS Constipation and has since been put aside like the Frigate.
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Used only once to melt some polysterene and battery powering my little Corsair but never used as intended for since I don't solder often.
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Doesn't work as well on plastic as it does cleaning metal but now since I'm starting on PE for my ships perhaps I might see use for it to clean and roughen the PE to take paint.
Cheers,
Richard