Glad you've got what you wanted sorted. If you've any issues with the shaft give Dave a shout, his service is top notch. I found the canopy by ditching searching for the description and going by part number instead.
Not to presume your knowledge or otherwise of flexi's, but they come in endless combination of sizes, not just length. That one is quite odd in that it's .150" flexi, 3/16" stub, most these days are the Aeromarine style where the flexi and stub are the same size, welded or braized on the join rather than bonded inside the stub.
Lucky for me that you have access to the part numbers for a Mk1 Blackjack 29.
Do you happen to have a link where I can download a copy of the original handbook for the Mk1 Blackjack 29 by any chance?.......or even just a parts list?
I am hoping that if I can find a copy of the correct handbook, it may include some spare parts drawings and numbers too, and that would help me quite a lot in the future.
As far as flexi-shafts are concerned, I know nothing except that I have them in some of my other fast boats and I always strip and grease them after every session and so far (touch wood) this strict service regime has kept them all running well with no failures (yet!).
I am hoping that once I get this sad example back together again and fitted with a new flexi-shaft that it will be also prove to be reliable and give me as much fun as the others (except the Relentless V2 which spends most of its life upside down - but thats another story!).