Hi Rod,
Looks like you wish to organize your work, I think that is great!
There isa very simple way to do this, for example:-
1 - Create one thread.
2 - Give it a subject like "My 250SL Refurbishing Record"
3 - Start with your planned work:-
Engine removal, restoration, and replacement
Engine refurbishment
General statement of progress made.
Link 1
Link 2 etc.
Fuel system refurbishment
This project will be next, revisit for activities and photos
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you see Rod, no-one can add tasks etc. or edit your first post only you. This way you can keep it organized and add system tasks, assemblies etc. and photos (link to an album were you can have more then 4 photos).
There would be no need to lock and or to unlock the thread. Other Members can post to you and you can reply to them. Your first thread will always (as long as you are a active full Member), remain as you wish it to be.
This way it might even be added to our Technical Manual in the future.
Another Tip I like to share with you is when you completed one task like the engine removal /refurbishment or replacement. Post a new post like "Completed Engine removal, see post No. 1 above" This then will show up to all as a unread post and they might then visit your thread again to follow you.
Cheers,
Dieter