Bob, I started to send you a private email but decided to go ahead and post this here for everyone. The best repair is one that will be permanent without adding mass to your cone. Much mass will change your qms. Although I doubt this minimal mass would be audible. Next, your repair needs to stay flexible so that the repair doesn't break during use.
I saw 4 repair idea's sorry if I missed one.
Silicone, tube repair, Cyanoacrylate adhesive and my mixture with a fabric patch.
Honestly they will all probably work. I don't know how Super glue type glues (Cyanoacrylate) will hold the tear in a moving surround, but his is the least mass. If it will work for sure, it is a good solution. The next lowest in mass is my fix. The idea is create a strong flexible glue. When you open paint that isn't mixed a clear fluid rises to the top, this is pure latex, Mixing this with Elmers Glue all gives you a fairly strong, but very plyable glue material. Fabric, gives the strength and backing to allow you to move the surround from the front and make the tear look as seemless as possible.
The silicone is heavier, but if it will hold without pealing off, it will work also. I would recommend you put it on from the rear as thin as possible.
The last is the innertube patch, It will be very strong, stick well and work, but will add the most mass to the cone. To do the best job, you will need to pull the woofer. If you are tying not to pull the woofer. I'd try the Super glue idea, by adding it to the torn edge only with a tooth pick, trying not to get any on the surround(you will see it)... and it won't come off.
Good luck, I hope this helps.
Tim
