Anatomy of a rail cushion

MamboFats

Active member
Hi all,
don't really how to choose a title for this.
Can anybody tell me what the purpose is of the cutaway arc on the inside of the rubber?
Maybe in earlier times there was a bulge on the subrail ?
Does anyone know?
s-l300.jpg
image.jpg

thx for the input ...

Alain
 
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