I trashed both my ABS sensors when I rebuilt mine and they were WELDED in place for sure. OME ones from Merlin are in the 400.00 range but I found a nice one from a salvage yard in California and itr was in perfect shape. Check the vendor area, which is how I got their contact info. I am currently riding around without a passenger side sensor as I have been too lazy to round one up. I took my dremel too and slightly sanded the hole where the sensor passes through and applied a good supply of anti-seize to the sensor. I seriously doubt it will weld itself again.

And FYI... the retail price from Merin on the rear sensor(s) was 1600.00 so be very afraid when dealing with those puppies!