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When I did the gridlines on my saucer I just used one of the extra bridge domes. The kit has a black, clear, and translucent white dome to choose from. I drilled a small hole in the center of the black dome and inserted the needle end of the protractor into the hole. Easy-peezy. I did the same on the underside.

[ATTACH=full]86943[/ATTACH]
Harbor Freight 6 inch Compass by Steve J, on Flickr

[QUOTE="trekriffic, post: 207405, member: 11008"] When I did the gridlines on my saucer I just used one of the extra bridge domes. The kit has a black, clear, and translucent white dome to choose from. I drilled a small hole in the center of the black dome and inserted the needle end of the protractor into the hole. Easy-peezy. I did the same on the underside. [ATTACH type="full" alt="9153338285_a18cf5eb03_b.jpg"]86943[/ATTACH] [URL='https://flic.kr/p/eWRfzk']Harbor Freight 6 inch Compass[/URL] by [URL='https://www.flickr.com/photos/29607470@N08/']Steve J[/URL], on Flickr [/QUOTE]

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