I have had a few of these do this, but not many compared to what I have. Ihave just put some tacky glue on and stuck it back on and I don't think they have came back off either... and I use mine all the time!
I have quite a few Cats Eye ink pads, which I usually get in sets because they're more economical. Out of all of those I have had only one come loose. It was that way when I purchased it so I e-mailed the company to find out how to re-attach it. Following is the answer:
"Sorry to hear about your ink pad falling off. To re-glue your pad, wipe excess ink from the base with a damp paper towel, wipe dry. Apply cyanoacrylac glue to the base and place pad on top, press into place. It helps if you let the pad sit for awhile to let the glue set up. We have found that E6000 glue works too. If this does not work for you please let us know. We will give you an RMA # so you can return it for replacement."
I had to Google cyanoacrylac to find out what that is in plain English. It's Super Glue, Crazy Glue, Loctite or Insta-Bond.
This is EASY to do, and although a couple years have passed, I've had no further problem.
I read this thread a few days ago and patted myself on the back for buying the petal points instead of the cats eyes so I wouldn't have to worry about this... I'm sure you can see where this is going...
Last night I'm inking some paper, and lo and behold, pad separates from holder. Now I must drag out the hot-glue gun and see if I can fix my petal points without having to go buy some Super Glue.