Morris Minor Owners Club

I am trying to re-establish a working horn push in the two-spoke steering wheel centre on my 1971 6cwt van.
I tried gingerly to lever the horn push out of the wheel centre. Guess what- it broke.
I was as gentle as I could be. What did I do wrong?
Also, how do I redress this catastrophe? Bite the bullet and order a new one from ESM? Or are there any secondand ones around?

There's a couple of used units on Ebay.

So there is!
Mind you, for the saving in price I have decided to plump for the new ESM one.
Thanks for the rpely though.