Flexi Retractable Dog Leash

Why don't you have a right hand Flexi holster carrier? You are just using a left hand side model

Theres an opening on the bottom of this retractable leash, does that serve any purpose at all?

I came on here to find out what the extra little clip thing was that comes with the lead... You can see it in this video hanging off the end of the collar attachment.

Any ideas?