No, with a 440horse squeeze you don’t slide down the base, you just squeeze it in place and hold for 30 seconds or more.
Both hands will be squeezing at this point to keep the blood trapped in between the gland (head) of the penis and the base of the penis
What a 440horse squeeze does is expands the whole girth as a whole from the bottom of the head to the base, while the regular horse squeeze is used for adding girth to the base because you are forcing blood to the base of your penis.
And if you want a complete girth exercise that works from the gland (head) to the base, then you would use the Uli for that purpose.