Benkei was a warrior monk in the 12th century. He is most famous for posting himself at a bridge in Kyoto and defeating 999 samurai and collecting their swords. The 1000th warrior he faced was Minamoto Yoshitsune who defeated him - Benkei became one of Minamoto's most famous warriors and eventually died in battle under his service.
His staff/spear is not anchored. It is resting in a slot in the wood which demands that it be lifted straight up - it cannot be leaned at all.
My first attempt lifting the Spear of Benkei was two years ago. Being with a group of 30+ students who were begging me to try to lift it, I had no choice but to try. The metal of the staff was very smooth with really no way to get a secure grip. There was a single, tiny peg sticking out of the staff at about eye level, but it was not an aid at all - if anything, trying to use it probably made it more difficult. It did not budge for me at all. There was a long line of tourists waiting to give it a shot, so I gave up after a couple uninspired attempts.
Last week, I had another go at it and as I was looking for a way to hold the spear lower and squat it up, found a very small handle towards the bottom of the spear. If you have small hands (which I do), you can grip it with one hand and essentially one-arm deadlift it up. Honestly, anyone who does any kind of heavy lifting at all should have no problem lifting it in this fashion. I felt almost like I was cheating, but my students and the tourist-crowd were impressed. I plan to lift it again without the handle and wield it like Benkei next time.