[Spridgets] Seat mounting - spacer material

[WeslakeMonza1330 at aol.com]

Hi list,
 
For many years the driver's seat in my Sprite has been installed with some  
crude steel spacers that are I guess, a quarter of an inch thick from 
something  I had kicking around my garage.  In the never ending search for weight 
 savings (a big push might get this years 1Kg saving up to 2Kg - about 5 
lbs) I  realised I could replace them with aluminium alloy spacers or a hard  
plastic.  The seat doesn't move on the spacers it simply raises the  height. 
 So, any reason not to use hard plastic rather than  aluminium?
 
Thanks
 
 
Daniel
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