Thanks JP, videos generally annoy me with their pacing (take too long to say something obvious then skip past something that's not - especially bad when covered in oil!) but I'm definitely hands on with this. Using old school written guides and pictures so far I've fitted a new cassette and disc brake rotor to new wheels and replaced the handlebars which meant new brake cables and swaped the cranks as well as tweaking the gears after the new cables (new bike) stretched - next up headset and BB, though they need expensive tools given how infrequently I'll use them so I might cheat. Or use a block of wood...
The only problem is getting stuck which is not an option as I use the bike to get to work, hence having to ride on and risk further damage. Having just woken up I have 2 hours to 'fix' it before it's effectively gone 11pm and I can't make noise in the garage.
The new chain is a 114 link as the 'new' cassette doesn't get close to the 32T on the old one, plenty of play left in the rear derailure so this seems a good choice. The cranks are the same model with the same size chainrings as the originals and the teeth looked good so I was expecting this change to go just as smoothly. Where the line between 'moderate' and 'heavy' load is I have no idea but the last time it came off it was on reasonable tarmac having survived heavier load over bumpy mud and gravel. There is one complication in that for whatever reason the 2x bike was sold with a 3x front shifter so after my latest tweaking session I had to double click both ways, which isn't ideal. I'll watch your video then get out and have another go, I guess it's going to say H screw but when last I looked there wasn't 1mm of gap so can't do much with that!
Edit: Tried to move the front derailure down slightly with the cable attached, needless to say that didn't go well. Moved it to do nothing so will be running an 8 speed today. I did switch the cassette back so hopefully 50x32 is low enough for the only real hill I have to deal with, if not I'll be walking for a little bit
)