Question on Trac II and Trac II Plus handle

[Den]

I have a Trac II Plus handle and underneath the bottom track there's this little lip I guess you could call it that sort of locks the cart in place and keeps it centered. I was wondering if the original Trac II handle has the same thing?

 

[platon951]

there is a middle metal click lever on vintage trac2 handles fits on plastic cartridge
this is made gillette brazil v-3 solid plastic handle/metal head

 

[NYShaver]

I have a Trac II Plus handle and underneath the bottom track there's this little lip I guess you could call it that sort of locks the cart in place and keeps it centered. I was wondering if the original Trac II handle has the same thing?

Yes.