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I am just about to get started on mine, from the reading I have done, the joint was leaded which will grossly interfere with MIG welding.
Did you clean thoroughly before you started welding (I presume you ground off/used a cutting disc to take the rail off)? Did you also take a wire wheel to the joint? I was planning on heating the joint to lead-melting temperature and then taking a wire wheel to it.
Not sure it will help, but very curious what you have tried.
D.
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