I recently purchased a T480s and after taking it apart to do a badly-needed clean, half the screws inside are missing, e.g. no screw for SSD, only 1 for the battery, various ones for the connections etc.

If I buy a specific set for the T480s, they're like £35, so I'm thinking of buying a large generic set from ali - what sizes do I need though?

M2 x 3, M2 x 4? for both the normal and the 'fat head' shorter ones?

Are there any others?

Also, bonus question, the previous owner did something funky with the screen and the sides don't seem to be pushed in equally all the way around - can I simply just apply force and push the screen into its housing so the sides align up equally, or do I need to actually take it apart?

I remember some time ago installing an app that allowed me to film in the background whilst having another app open on top. I believe this was from f-droid. I actually have a legitimate use for this.

Could someone please suggest its name if they know, either from f-droid or a decent (trustworthy) app from the play store please.

I'm in the UK and looking to switch over to a UK host provider. Can anyone recommend IONOS for the uk? I'm considering a fairly low-spec VPS. Even with VAT, their prices will be about 3/4 of what I'm currently paying.