Hi Alex. I have had the same issue with my 70131 and have used 2216 from 3M. This is a slightly flexible high quality “space qualified” bonding material that bonds well to metals. I don’t remember what the max temperature is for this material but we used to cure it in a (vacuum) oven around 80-90*C.
After I have machined away the bonding material to close to the magnets I will wrap a high strength thread around the magnets and reapply 2216. This to let the embedded thread take the strain rather then the bonding material.
Hope it works out well for you.