That's very interesting. The sprocket I was sent is definitely not the revised, keyed version. It appears identical to the one I am replacing. Ie it is a single piece welded item with 2 toothed wheels on a left hand threaded boss. The one shown in the bulletin you usefully attached, is clearly completely different and made up of several parts.

The thread on the reel is not damaged. The old sprocket screws on perfectly.

So, if you are correct and the thread pitch was never altered, the only explanation is that the thread is damaged on the part I received.

I received a reply from Masport today that simply said "I have checked with our engineer. 004298 is obsoleted and new SPROCKET ASSY-10/23,KEY PKG (item 032006) doesn�t fit the old model unfortunately" which seems to suggest they think I've been sent the keyed version when of course I haven't.

When I get home I'll post photos to illustrate.

Please let me know if you think my analysis is incorrect.

Thanks.

Last edited by Finnkai; 21/08/17 06:26 PM. Reason: Typo