PSU for ThinkPad W520

The PSU for my ThinkPad W520 suddenly stopped working yesterday and am wondering what to do about it. Are they repairable or do I need to find a replacement?

It's a really big heavy PSU, a genuine Lenovo 170W 20V. Every other PSU I have is about half the size of this one. So as long as my replacement has this power rating should it suffice?

Whilst looking for alternatives I came across various GAN chargers and wondered if one of these could be used as a replacement. Anyone know?
 
After some searching I'm told that I need something which has 'Lenovo barrel plug + ID pin handshake'.

What on earth is ID pin handshake?
 
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