On Fri, 24 Jan 2020 10:58:11 -0000, "Brian Gaff \(Sofa 2\)"
wrote:

?????
Brian

He's either replied to the wrong place or thinks that's enough of a
question to yield a useful answer. ;-)

The correct answer would be 'whatever was there by design' as the
wrong type of replacement could either damage the drivetrain (if too
strong) or shear prematurely, leaving you in a vulnerable somewhere.

Cheers, T i m