Bloody weld symbols...

I'm looking for a way to make a weld symbol that looks like this: 

The closest that I found is a symbol, modified years ago by a colleague who is no more, that looks like this: 

Problem is it's just not very accurate - reinforced half-V should be reinforced half-Y. 

I've tried to use the symbol editor to modify a copy of this thing, but to no avail. I don't know what lines to change/add and how this will work in symbol properties. Ideas anyone?