That’s actually a good idea. But i dont know anyone who does that
Here is a link
http://www.supramania.com/forum/thr...arm-poly-kit-information.248646/#post-2107023
Look for post by user Piratetip.
I paste his write up here:
The majority of the control arm superpro bushings are 2 part, so those don't need to be drilled.
The center where you drill and tap the zerk to go just feeds the silicone grease directly to the center steel sleeve.
The bushings that are 1 piece - I do in this order:
-Drill and tap the arm for the zerk (orient it so its facing to be accessible later and not interfering with anything, usually in the center)
-Temp install zerk to verify everything fits right, then remove it for now
-Clean all metal burrs and use compressed air to clean all shavings ect..
-Press the bushing into the arm
-Use a small drillbit - 1/16" or 5/64" to drill out the bushing directly in the center of the zerk hole.
-Clean out the bushing shavings and verify the hole is open all the way down to the center sleeve
-I also use a zerk that sticks out ~5/64" into the center bore of the arm - This applies some sealing pressure to the outside edge of the bushing, important for directing the grease to where you want it to go. It probably also helps the bushing from rotating in the bore.
-Grease the center sleeve and press it into the bushing.
-While off the car I usually test that my grease gun is pushing grease where it needs to go with the zerk.
-Clean off the grease thoroughly from the edges of the center sleeve and install the vehicle, torque down.
-Done.
I grease about once a year.
Never encountered any squeaking noises that people talk about with polyurethane bushings.