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A useful tool in my box these days for removing oil and contaminates from all metals, is pressure pack carby cleaner, have brazed a lot of cast iron and it's not so hard. (including manifolds)
I'd mount the bracket by the mount holes, lay it flat and just braze the piece in, there is not enough metal to stop the heat flowing throughout the surface, so there's no need for all the extra preperation.
Looks like something has been done to the "thumb screw" holes as well, as they have slight raised "lips" around them on the side against the pads.
My wonder would be how well the grinder bloke cooled it as he ground, otherwise he may have warped it already!
To redo, better to mill out square and insert a block with a couple of screws, fill the screw slots and gaps with solder or any filler of your choice and paint over.
Number partially ground out looks like M7421 and the milled out number you could probably determine with the aid of black light or whatever it is the police labs use.
---------- Post added at 08:57 AM ---------- Previous post was at 08:55 AM ----------
Just mind you don't have any carb cleaner still there in pores or pockets as heat turns it into Phosgene apparently and the smallest whiff can make you a very sick man indeed.Quote:
Originally Posted by muffett.2008
Surpmil, it's an optical illusion. There are no lips. Don't think it was done with a grinder, it's not warped and when mounted on the rifle it's dead on. It appeaers to have been milled out and finished up with a file. Looking at a 2D picture is not like having the real thing in your hands. And just for the record, I'm a retired Mech. Eng. that started out as a machinest/tool maker and now a full time tinkers mate with a complete machine shop, so I do have little knowledge about what I'm doing. I do think your suggestion is the best for restoring it to the proper look. I think that welding/brazing/soldering is a fast track to disaster.
To be fair Charlie, we all gave you our thoughts - just as you asked - and..............
Just one further point if I may........ Is it numbered/matched/mated to your rifle?
If it were mine, I would bronze braze a patch in and then have Brian Dick suncorite over the patch to disguise it. Before doing so, I would clamp a large steel bad of the proper diameter into the rings and build a heavy steel plate with shim pillars to attach the mount to in order to mitigate the chances of warpage.
I'd then heat the part with OA and braze away. Should work, nothing ventured, nothing gained.
Peter, the just for the record remark was not intended to be snarky, it was just meant to advise that I do know some small amount of what I speak. In answer to your question, while this mount came with the rifle the numbers do not match. That's why I was suprised to find that it lined up so well. I made up a test bar with a laser bore sight that mounts in the scope rings and a second laser bore sight mounted in the bore. Set up in a rifle rest it's right on at 50 Ft. in both axis.
I'd just dam it up and fill the gap with steel filled epoxy, dress it up and paint it. There are no heat issues and you'd barely be able to tell.
Exactly what I did for the IWS brackets, though not having your background or resources, my setup probably wasn't as good!Quote:
Originally Posted by Charlie
Hey Charlie is this not the same bracket that's now numbered to a certain L42A1 being evaluated in another thread?
Good eye VintageHunter. The missing chunk seems to have been replaced, and quite neatly with only a colour change revealing the repair.