Stop, Rod, Bullet
When placed on the rods for your knee levers, they will keep the knee lever from flopping around when casing and uncasing your guitar.
Place on one knee lever rod about 1/4"-1/2" from the changer finger.
These were on my MSA when I bought it. I do not know if this is an OEM item or if someone fabricated them aftermarket.
Price is for a package of 2 stops.