I've done  12mm myself in the past.
the critical thing is it's not too long.

if I get a chance  I could put the two side-by-side and get the length
difference to the 10th mm.

scott

On 12/20/2013 9:08 AM, Keith Hughes wrote:
>   Date:    Thu, 19 Dec 2013 00:25:54 -0500
>   From:    Karl Mullendore <tdiguru@WESTYVENTURES.COM>
>   Subject: Re: Diesel input shaft
>
>   Any waterboxer input shaft will work, after the end is
>   trimmed by 10mm length.
>
>   Thanks Karl,
>
> I was not sure of the length that needed trimmed, and had none for comparison.  You're sure 10mm is the Magic Number?
>
>
> Keith Hughes
> '86 Westy Tiico (Marvin)
>