Ok, chances are you’ve cranked it enough. If you don’t have the strength to continue, you’re probably over-cranked already.
The issue is most likely going to be lubrication. The thick YYJ doesn’t always do the trick. Vaseline works miracles in this regard. Been using the stuff for looping since the 90’s, and see no reason to stop.
Get some Vaseline, more commonly known as petroleum jelly. Vaseline is just a brand name. Any PJ will do. Now, you can either use flame to liquify some into the bearing, OR you can unshield the bearing and pack the stuff in. And I do mean pack. FILL the bearing with it. You’ll throw most of it out with a few minutes of play, and should be getting close to top performance shortly thereafter. Back in the day, folks used to just leave a bearing sitting in the plastic container the goop comes in overnight. You can try this as well, just leave the container somewhere relatively warm.