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    • Doubt that diamond paste will be effective on a filed surface as it will be 'rough' by polished standards.  ! would start with wet&dry papers going down to 2500 grit then go onto the polishing pastes.  Thoroughly clean after every grit/paste size and do on a flat plate.  Dialux bar polishing medium (grey I think for steel) may be better than diamond paste.
    • Quite cool pice of history..
    • I missed your post with the balancestaffs.com 30T2RG = OME26.5 BS4132 (RONDASTAFFS1856) (A=305) This also has an early inca version BS4133 (RONDASTAFFS4187) (A=305) 30T2PC = OME260  BS4149 (RONDASTAFFS3276) (A=329) and now I see what you mean, here they say you could use the slightly longer version too BS4148 (RONDASTAFFS1858) (A=332) which I'm not so sure of, even if the staff lenght isn't that far off it might affect the movement of the balance wheel since the pressure from the inca block springs would be slightly higher all time and one might not have any endshake at all. I would go with the original lenght of these.  
    • A gents "UK Time Dundee" on the bench today. This is one of the earlier Dundee Timex watches as it has the "UK Time" branding, so probably mid to late 1950s This is what arrived in the post. Not very clean and that crystal is almost certainly made from pure unobtanium. The "works" are stamped Made in Britain, but later versions often had Made in Scotland on them. I have it running, but the winding mechanism is badly worn (who would have thought it, looking at that crown ), so it feels a little "gritty" while winding. I used UV cure phone glass glue to close up the cracks in the crystal, but it really needs to be replaced. None the less it ticks and tells the time, and I've removed the case klingons, and given everything a good shine, so it is a whole lot more presentable. I'll let it run for a bit and regulate it. Another piece of local history joins the 404 collection.  
    • I've been making some screw recently out of 316 steel but my stalling point has been polishing the screw heads. After I cut the slot I have been filing them flat then rubbing them in diamond paste.   I apply the paste to an aluminum sheet and start with 45 micron diamond paste and rub the screw heads in it. Clean them then repeat with 8 micron and 0.25 diamond paste. However the finish is not good. I'm aware if you buy sets of diamond paste there are 7 grades to go through so it might be I'm jumping sizes to quickly but as the paste is expensive I thought I'd check here first. From start to finish how long should it take to polish a screw head.   This is quite frustrating because I feel like I've go the hard bit down but the part that should be easy is not working.
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