Yes, that is a wonderful way to do it. Let go and let God.
Currently, I have the help of the Residential Treatment Center (RTC) Matt is in to structure our time and the parameters about which each conversation is going to contain. It is really helping to change the dynamic of our relationship, However, he starting to get more and more time on the phone, and I can see the old ways start to creep back into our conversations. I want to fix every problem he brings to me - and I literally have to bite my tongue not to continue this cycle that I am much repsonsible for as he is.
That is why I still insist on our phone calls being every other day, only for 15 minutes, and only about the progress he is making, or fun things he is doing. He actually adheres to it better than I do, because I can see down the road, and see how a certain thing he is doing are going to impact him, and I want to step in a be the yield sign in his life.
I read co-dependent no more years ago - and I am going to go purchase it again today at Half Price Books. Just so I have the words right when I speak to him. Maybe you already have that book? It is very helpful.
But for you, maybe following this same outline the Residential Treatment Center (RTC) has set up for Matt and I would help with your own son?
And again, write it down, so that when he calls for money you have the script in front of you on what and how to say it. The how is the important piece. Something like "Z that is really tough. You know I cannot help, so what are you gonna do?" Putting the onus back on him, every, single, flipping time. A weird analogy is potty training a dog. Don't let difficult child poo in your house. Every time your difficult child tries to "dump" on you, remove him and put him outside of your boundaries.
Hugs and strength.