You won't screw wood or anything else to the top of a swienty national. There's nothing to screw it to where the frame lugs are, that edge is roughly 12mm and the top is bevelled. There is no getting away from the fact that they have a design fault, they overlooked the BBS rebate, so running them without rails is a work around. At least abelo has been designed as a poly version of a timber nat. Pity they weren't around a few years ago, too much kit to go swapping now.
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