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I've seen shells modified simply by filing (or grinding) them - in all sorts of dimensions.

This used to be a common bodge to get more life out of old shells,

when they were simply unavailable - or new ones were unaffordable.

Matchy twins reportedly had to use an "adjusted" mini shell in the centre bearing, until quite recently.


I think they are always filed/ground away (direction) from the inner surface, to avoid your burring upwards.

And the triple layer type shells must on no account be scraped on the working surface,

the outer working layer can be exceptionally thin.

What you mention wouldn't involve this though.

Have fun !


Are spares not available for these ?

That seems like an oversight by someone .


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