Where can i find heavier collimation springs?

I own a zhumell 10"dob and want to modify it adding heavier collimation springs to replace locking nuts... which springs do u guys recomend me?

thanks in advance

Osvaldo
Ace Hardware does have an assortment of springs. My selection was I believe a #50 or #52 (somewhere in that range) which I cut in half using a dremel tool. It slid over the extension of the collimation screws. Also, the original springs could be contained inside the new spring, so they were kept as well.

Hello Osvaldo,Scopestuff.com has the stainless steel springs that they sell for the 10 and 12" Meade lightbridge.These may work,they cost $14.00 .Regards,Darrell