Hi there - I've got 2 Acer Spin B TMD118-RN-C4HX laptops with damaged DC-in jacks where the plug won't go in..
We're in the UK, and this is a small village school with no money! 
I suspect this has been caused by careless kids... 
The DC-in connector is soldered onto the motherboard.
I'm quite happy to take the board out and resolder the connectors - but I can't find suitable replacement jacks to buy. This is the type with the very small 3mm diameter x 7.5mm long power jack and 19v 45w power supply.
 Can anyone suggest a source or part number for replacement parts. Any assistance gratefully accepted.