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@lpg
if the new sprocket is wider, there may be less avaliable space to screw on a lockring. if this is the case, make sure the sprocket is on as tight as possible to free up some threads to screw a lockring on. the lockring is probably just not biting because the new sprocket is wider..
if the actual lockring thread has stripped, i would just tighten it up as tight as possible anyway (possibly using rotafixa method or hammer/screwdriver method), and then dont skid/backpedal for a few days, it should then be tight enough.