I am having trouble successfully replying to you for some reason. Spent a lot of time drafting the last one but it got waylaid somehow.....
So - Thanks for the quick reply Trak - and thanks for the video.
I am dense when it comes to things mechanical so please indulge my questions:
I took my back wheel off and cleaned it up.
In the video the guy hand tightened the cone and then jumped right into tightening the locknut.
In my case do I:
1. remove the locknut with a 17mm ratchet
2. tighten the cone (with a 15mm cone wrench - that i will buy)
3. hold the cone in place with the 15mm and then ratchet on the locknut with the 17mm ratchet

How should i visualize the job of the cone?
Is it generally ok to hand-tighten the cone and just use the wrench to hold it stationary while the locknut gets set?
Sorry for all the questions
Thx
Pete