Thule Yepp mini bike seat (Ringmer BN8)

Thule yepp mini toddler seat. Got off Freecycle a while ago but haven't used it so passing it along! Sits on the stem/top tube to have your child in front you.No key to lock the mechanism, but I believe you can get one from any Thule supplier, and I imagine you could bodge a secure fastening pretty easily!