The 511 spring is a copy of the Losi BK2 diff spring I believe. The original 501X spring was too soft so the team switched to the BK2 spring - and Tamiya made a nice copy for later cars 
This is the spring:
http://activesport.co.uk/shop/articl...aid%3DA2933%26
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Last edited by jimmy; 20-09-2012 at 02:56 PM.
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