If you're loosing the scraper side of the Tunze strong, chances are good that you needed the Strong+.
I'll _NEVER_ go back to any other brand of magnetic cleaner. LOVE my Tunze. Cleans great, doesn't scratch the glass, or damage the seals.
Used to scratch the heck out of my tanks with a Magfloat. Changed to the 'Flipper'... and watched it destroy the silicone in my tank. No, thanks.
Won a Tunze in a raffle, used it on my 60 cube. Awesome. Bought a Strong+ for my custom 140. Great. Still using the standard on my sump.