Metal pin is loose

We must join the review of moon sasa, dental hygiene super - we do not want any other toothbrush more - apart from the discoloration on the handpiece head and bottom for the first few months of use - but there must possibly be cleaned carefully..
Our observation: Both handpieces are worn out after nearly three years in a short sequence, more precisely, the said metal pin is loose, so that the entire brush head vibrates worn.

Tip: Carefully detach the bottom cover and press with a screwdriver the plastic retaining clip, so you can pull out the entire interior including metal pin down..

-> What to see ??? A simple Phillips head screw secures the metal pin on the device - this seems to loosen during use.

-> Tighten the screw - and push back gently

Conclusion: has in us then for a few months to work -> but were probably the seals no longer quite in order for the release action -> So here particularly careful in repairing -> we then had electronic dropouts, ie the brush was spotty at ....

-> Would be nice if Philips is expected to rework here - but 3 years rich indeed for the warranty period ;-(

UPDATE 12-2013
As you might expect, by now less than a year the same "problem" at the new replacement handpiece, .... - bolted> with the above method and in addition Loctite again. Let's see how long the head now holds. An imposition of Philips, the quality. Of course, the replacement handpiece individually available also have no 2-year warranty more ,,,,