I always find them quite satisfying! While they're not exactly simple to pick, but they have very clear feedback which helps a lot!

I've only picked a few tubulars, most can be tensioned with almost anything as long as you can get it into the notch of the centre.

There's a couple of common diameters used so a couple of tensioners are handy.

Time to dig out my tubular locks again!

It's the spline key that is missing. You can usually find some on ebay!

Interesting to see plastic wheels, all my locks have metal wheels. Bet that makes for an interesting open!

Nice one! Glad I could help (not that I did! 😅 )