you dont...mine used to curve downward....but an [words=http://www.phallosan.com/shop/catalog/default.php?z=eNortjIxtVKyL0pNszWxMFcrSSxKTy2JL0hMT7U1UisoykyxtbBQSy4tLsnPjS8uKcrMS7dVsgZcMMpbEbo%2C]ADS[/words] and some light hanging corrected it...its pretty much strait now, i dont think you can make it curve up, it sounds really risky, to do so would be GIVING yourself PD rather than correcting it