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SnakeDrake said:
Need help from ratchet and clank fans whats the best way to grind for screws need it to buy the RYNO gun and beat the annoying last boss. (Its the first game of the series )

Infinite Bolts (taken from GameFAQs)

(You will need the hologuise and the Taunter for this glitch to work) After you get the hologuise, go to the hoverboard track in Blackwater City. Equip the hologuise and enter the race. You can now freely walk around the racetrack. Head towards the big jump. Stand under the platform where there is a large amount of crates. Equip the taunter. As long as you hold down the O button, bolts will rain down towards you. Note: this can be done only once per game. So until you beat Drek & start a new game you can't do it again.

 

There's also this guide: http://www.gamefaqs.com/ps2/561107-ratchet-and-clank/faqs/21852