If you look at the BSA factory conversions they have silver soldered (I think) a piece of steel into the oval cutout and then drilled and tapped that
http://pic3.picturetrail.com/VOL14/1...4/50084772.jpg
If you look at the BSA factory conversions they have silver soldered (I think) a piece of steel into the oval cutout and then drilled and tapped that
http://pic3.picturetrail.com/VOL14/1...4/50084772.jpg
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