"Tim Angus" wrote in message
news:20050514235946.1464e64b.MyForeName@TheLast4Ch arsOfMySurname.net...
How might I manufacture something like this?:

http://a.ngus.net/internal_splines.jpg

Something with an OD of about an
inch would be ideal.

My recommendation: go to your local automobile dismantling yard and get an
old driveshaft with a slip joint (this is the part that's splined). Cut off
as required.

- Michael