This is what I am currently working on.
At first glance, it looks like a 2-shuttle work because of the rings, in this case 3-rings clover, sitting on top of the chain. But, as you can see in the picture, I am tatting this with shuttle and ball.
The picture above shows the point where I would normally need to use a second shuttle as the working shuttle because the double stitches for the chain will be made from the shuttle thread that I am currently using.
One alternative to work around this with shuttle and ball is to use the shoe lace trick method, or SLT, as shown in the picture below.
A knot is made with the shuttle thread and the ball thread to switch the position of the shuttle thread so that the chain can be worked off the ball. But, by doing so, you will have to make another SLT at the end of the chain to be able to make the 3-rings clovers at the top of the chain, as seen in the next picture.
From my experience of using the SLT for this type of situation, it will result in a kink in the chain holding up the 3-ring clovers. I don't like having kinks in my chains in this case.
The other alternative is illustrated in the next picture below.
Here, instead of working the chains off the ball thread, the double stitches are made from the shuttle thread with the ball thread as the core thread. But these double stitches are unflipped. On completing the required number of stitches for the chain, turn over the work and the shuttle thread is in position to make the 3-rings clover on top of the chain.
Another case where you make unflipped double stitches other than when making split rings.