Illinois 18s - 47303 "T" End View larger

Illinois 18s - 47303 "T" End

Illinois 18s - 47303 "T" End

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Illinois 18s - 47303 "T" End

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Illinois 18s - Part Number - 47303 "T" End.  These are the "good" ones.  While perfectly good, over time, the standard "blue - steel" mainsprings will take a "set" (not uncoil properly and therefore not provide full power) and may even break.  The "white alloy" mainsprings (sold under various trade names) will neither take a set or break.  These are getting harder to find.  They may cost a more but they are definitely worth the money.  I have a very limited supply of these and no ready source to replenish them when they're gone. 

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