I have 'pretty' mechanical pencils and pens (christmas presents). Also, worn-out rotrings.
Bit fed up of using them for work jotting. Leads either wobble, or don't extend well, and snap.
So, during xmas break I bought myself a utilitarian 'propelling' pencil. Faber-Castell Grip Plus.
It is excellent in all ways except aesthetics.
Lead extends well, and the whole nib/lead holder retracts.
No lead wobble.
Eraser is permanently exposed, hence quick to use. It is a long eraser, about 30mm, extruded by a rotating knob. Spare came with pencil.
Absolute bargain at £9.99.