Y'all should be trying to find a wastegate that fits the 1987 190D Turbo, which
should be 100% bolt on for the 124.128 motors. I was never able to definitely pinpoint the part number for this, nor locate a source... I think it would eliminate the need for rethreading the rod or shimming the mount. Since I no longer own any 602.962's, I'll have to pass the baton to the next guinea pig.