Q I have a pair of Boston Acoustics A60 speakers that I have had for more years than I can remember. They are quite adequate for me, but the woofers” rubber surrounds are disintegrating after… ...

It's a pretty standard repair. Beware that if the drivers are used a lot without a functioning surround, you risk damaging the voicecoils, as they won't stay in proper alignment without a surround ...

What I am trying to figure is how to repair it (I would do the other one at the same time as its surround is just as old albeit not with a tear).