While removing the main aileron pushrods (XNB-W07-08) to better enable storage by covering the lightening holes with 3 and 4" plastic mailing tube caps, found the port wing rod end bearing bolt was an AN3A-12 rather than a drilled AN3-12. It took a surprising amount of time to gently remove the incorrect bolt without putting undue force on the idler. Resorted to using a spring-loaded center punch to encourage the bolt to back out of the assembly by repeatedly punching the bolt center. Replaced the bolt with AN3, torqued the nut to 3.5 N, and installed a cotter pin to both port and starboard idlers, leaving the main pushrod rod ends in place on both wings.