if they are similar to 269-107


the construction is much thinner, from a harder, "more brittle sounding" polycarbonate or something, not the same as the H-290 plastic. The brass insert looks well machined, at any rate. I just wanted to use the included 2/3 bolt to screw-on adapters as "drilling jigs" to allow the use of jbl 2426's and other 1 inch, 3 bolt drivers on my 511's (oem is 2 bolt) in the future. Sam


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