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Job done. The focuser will now wind vertically up with the weight of my binoviewers. I erred on the side of removing too little rather than too much aluminium and the flat section still isn't completely flat but it seems to work well. There isn't anything inside the focuser body to fall out of place; there are two pairs of of rollers mounted towards the top of the focuser(photo shown). After the sharpening stone I used wet & dry sandpaper to remove the scratches left by the stone. I also covered the ends of the focuser with tape as suggested by one place on the internet to keep debris out of the tube.
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