I encourage you to try my system with the spring on the outside of the bar applying it against the frame !
it is very easy to open , just tilt the bottom of the bar out of the groove , and let it go down gently by gravity , with a little help retaining it .
To close it , raise it , and the springs will force it into the groove and hold it there !!
No need for any other locking mechanism , it suffise to it self , providing the tension of the spring is not too strong
SM2K # 471