If you look at all the current chassis from the past 3 or so years, none of them (apart from the TC5 I think) have a countersunk upper deck, as manufacturers realised that tweak can happen because of the countersinking (the chassis twisting, and the countersinking grabbing onto the screws, stopping it going back to the original form).
Quote, Leodis, 2007: ''I've been shopping online for 9 years and the only charge I've ever had to dispute with my credit card company was from TiR. Congratulations TiR. Even porn sites are more ethical than your company!''
RC cars - I haz sum.