Rumble gearbox

[HammerWihoutASickle]

I finally finished replacing the gearboxes on Rumble the T-90. Filing his sprockets was a pain to accommodate for his new, large screws that attack the wheels and drive shafts together.
I can't help but feel some resistance on the left tracks, but some lube fixed that. I didn't put these round things (I forget what they're called) in between the sprocket and shaft assembly because it didn't want to fit.

Should I run it as is, or reassemble with them?
Also in the pictures is the lube I used that the hobby store suggested I use.

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[c.rainford73]

Hello are those lock washers that might fit between the larger screw and the drive sprockets? I use them but if not at least add a dab of liquid thread lock on the screw tips before you sinch them down on the hubs

[HammerWihoutASickle]

Hello are those lock washers that might fit between the larger screw and the drive sprockets? I use them but if not at least add a dab of liquid thread lock on the screw tips before you sinch them down on the hubs

Yes, that's them. I'll add some liquid in there.
Thanks for the heads up.

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[c.rainford73]

Just a wee bit to keep them from loosening