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<blockquote data-quote="keep_hope_alive" data-source="post: 7628723" data-attributes="member: 576029">i have PVC caps also.yes, the same principle.the idea is to eliminate any hard edges around the tweeter.&nbsp; using a cylinder (pvc cap) is very similar to a sphere.The Forstner bits are the way to go - but mine have a smaller guide spike&nbsp; $25 for the small set, $50 for the set i have.&nbsp; the larger bit is $25 by itself.&nbsp; You could just buy the forstner bit that is the size of your tweeter.&nbsp; The Irwin version has a better guide spike.&nbsp; The hole in the wooden sphere is larger than the spike, so the forstner bit wobbles a bit at first.&nbsp;&nbsp; If you have a paddle bit you can get a similar result.&nbsp; If you have a hole saw, you will need to fill the hole created at the back.&nbsp;&nbsp; you will need a vice to hold the sphere steady, and i have found double-sided foam tape works well to prevent marking and hold it in place.I have access to a drill press - and will get it in my garage soon.</blockquote>

[QUOTE="keep_hope_alive, post: 7628723, member: 576029"] i have PVC caps also. yes, the same principle. the idea is to eliminate any hard edges around the tweeter. using a cylinder (pvc cap) is very similar to a sphere. The Forstner bits are the way to go - but mine have a smaller guide spike $25 for the small set, $50 for the set i have. the larger bit is $25 by itself. You could just buy the forstner bit that is the size of your tweeter. The Irwin version has a better guide spike. The hole in the wooden sphere is larger than the spike, so the forstner bit wobbles a bit at first. If you have a paddle bit you can get a similar result. If you have a hole saw, you will need to fill the hole created at the back. you will need a vice to hold the sphere steady, and i have found double-sided foam tape works well to prevent marking and hold it in place. I have access to a drill press - and will get it in my garage soon. [/QUOTE]

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