Re: hoop with pulley on the aft of my boat
It doesn't look stable enough! I would remove it and set something else up. And attach it properly.
It would be quite a mess if one end of that aft rail thing puled off. Then you loose control of the main...
There are different (and safer) ways to keep the main sheet on the end of the boom.
OH just one note. The way that thing is bent shows that whoever installed it doesn't have a clew of how it is supposed to work!