Slimline Salad Dressing?

Last weekend I finally got round to dusting down the hi-fi amp and speakers that I bought 24 years ago and connected them up to the brand new CD player that I bought last year, but had packed away until I could get covers to prevent small fingers from damaging the speakers.

I couldn't really get a satisfactory metal grille solution, so the reason that I connected everything up last weekend was that I'd decided that I could trust the kids.
They've never really touched the surround sound system in the front room.

One of the speakers has a cloth cover. The cloth cover had come off the other speaker.

To my dismay this morning I discovered that Frodo had poked in the centre dome of the woofer. I knew it was him, as he ran a mile when I discovered it. After a good telling off I established that he'd pushed it, thinking it was a button (he was trying to figure out how to turn the music on).
Luckily he hadn't touched the tweeter.

I got him to help me fix it tonight - he helped me turn a few screws whilst I took the speaker out to examine it from all sides.

Googling for a solution suggested the following options.

i) Suck the dome back into shape with a hoover.
ii) Pierce the dome with a pin and hook it back into shape.
iii) Use a piece of sticky tape to pull the dome back into shape - start with say masking tape and work your way through sellotape, parcel tape, gaffer tape etc until you find something just sticky enough.

I decided that option i) could work, but a Dyson might just rip the dome right off.
Option ii) would leave a small hole, that might degrade the sound.

Therefore I went for option iii).
Masking tape, and sellotape were no good, but a piece of parcel tape did the trick. Hooray!

The speaker is now working as well as before (warm bass sound with plenty of middle and crisp clear high's), and has a taught cloth cover protecting it from further mishaps.

For those that don't understand, the title of this post refers to the Not the Nine O'Clock News Gramophone Sketch :-