rectangular tip to round tip converter ?

does anyone know if there is an adapter to fit the newer rectangular tip to my older round tip ? I'm looking out for the situation that I forget my charger and have to borrow someone else's - all the new lenovo models have a rectangular tip so it is looking more likely that I will run into someone who has the newer tip and I want to use it in my older thinkpad.

All the converters that I have seen talk about round to rectangular... but not the other way around.

 

There's a ton of cheapo ones on eBay. I've bought three of them and they all work fine.

 

hi there - thanks for the reply. Would it be possible for you to link me to one ?

I'm only able to find round tip to rectangular tip converters (which essentially enable you to use older chargers on newer laptops). I'm not able to find rectangular to round tip (which enable you to use newer chargers on older laptops)

 

Oops; my mistake, I thought you were asking about the round to square ones... I've haven't seen anything for square to round.