Does anyone have a good method adding a leader to a block?

I have a block for an "oil can" symbol and I can't figure out how to get a leader attached to it.

Here is what I want:

I created this using a multi-jog leader just to illustrate.  I don't like this solution as it the leader doesn't stay connected with the block, and even when grouped they don't move together right, and it's just a very fragile relationship that doesn't work well.

I do see an option for having a leader on the block properties but even when turned on, I don't get a leader