I have owned both the Spectral MCR and MCR Signature. The Signature is / was a great cartridge. Bass was superb. It is even better all around used "nude" / headshell removed.
I do believe these were made by Lyra for Spectral. They will not re-tip them. A re-tip by anyone else with not be the same.
If you are not confident in mounting it; have some who is, do it. I agree, the cantilever is not robust. Take care when cueing. It had superior specs in its day.