slightly pushed in softdome tweeter on Fritz speaker

I hope I am not sounding rude but how about giving Fritz Heiler a call. After all, he made the thing. Will it affect the sound? Will it? Listen to it and tell us what you think. You have the fruit in your hand, tell US how it tastes my friend. 

I have used a pin or needle to pull out dust covers. Works well with fabric dust covers, I think it would work on a soft dome without leaving a mark. It's not necessary to push the pin through the membrane but more of a side stab and pluck. 

Blue Painters tape is the way to go. You most likely DO NOT even need to adhere the tape firmly, just enough to 'tack' on to the textile. Stay FAR AWAY from a needle. lol

While you're shopping for the blue tape, might I suggest some duct tape to and perhaps a rope to secure your wife in a room FAR FAR away from the Fritz's. ;)

It's just the dust cover, should have no bearing on the function of the tweeter.

Thanks all for your suggestions, I tries the variations of the using a vacuum, etc. 

What actually worked and well (go Figure)  I used my index finger very gently on the side that was fine, and protruding normally outward, (non dented)  actually pressurizing that side, pushing and forcing the air over to the dented side, which then popped out to normal. I guess actually pressurizing one side to force out the other. If anyone else has this issue, it worked for me, looks perfect now.

Don't know whether this is a good analogy, your tube of toothpaste is almost empty, and you cant get anymore out. However, if your squeeze the end and roll it up,  it forces what air and product is left out. Thanks again, hope this helps someone!