Contact Craps... I mean Krups they sell a non-pressurized baskets that will fit ur 52cm GH (thinks thats the size yeah). Its about $30 but will hugely change ur shots!!
Last week I put up a three about preasurised and non-preasurised baskets read it it has some food links which show how to "alter" ur preasuried basket to become non.
Good luck!! Let u know how u go!!