There are several things you can do to make the rigging easier.
1. Clean the pins on the ends of the spars and the mounting pins with 00 steel wool.
2. Clean the bearings with with a good cloth or Q-tips using a solvent until they are clean and move easily.
3. Lube all of these surfaces with a good grease.
4. As Dave suggested, install Teflon or UHMW slides where the spars slide into the fuselage.
5. Clean the spar pin holes in each spar similar to the bearings.
6. Clean and lube the spar pin carefully.