A Cartridge that has been unfortunate to have a Stylus broken off, where the break is seen to be within the Cartridges Main Body, is a very different damage to a Stylus being broke as a result of a bend in it, or a Stylus needing to be re-tipped.
A stylus break within the body can damage the whole connection assembly inside, the bobbin and generator can incur damages, and these may not be able to be set back up to the manufacturers build specification.
A Cartridge may be returned as working after a treatment, but it may also be compromised in its performance.
I would be careful when going down this route, and would need to be completely assured of the success that can be produced with a rebuild.
A stylus break within the body can damage the whole connection assembly inside, the bobbin and generator can incur damages, and these may not be able to be set back up to the manufacturers build specification.
A Cartridge may be returned as working after a treatment, but it may also be compromised in its performance.
I would be careful when going down this route, and would need to be completely assured of the success that can be produced with a rebuild.