Check the listing for details. Spindle Gear Assembly For Porter Cable Drywall Sander PC7800 #877787 - OEM. Condition: New. Listed at 75.53 USD. Spindle Gear Assembly For Porter Cable Drywall Sander PC7800 #877787 This is an OEM Porter Cable 7800 Drywall Sander spindle gear assembly. It is used in the Motor Assembly. Al's Taping Tools is the Largest Drywall Tool Store in the World! We are also a fully equipped, family-owned, and operated automatic drywall tool service center with over 35 years in the industry. We sell and service all major brands of automatic drywall taping and finishing tools. All of our service techs are also fully trained in the operation of the tools we sell and service. So if you are new to automatic drywall tools or have any questions, please give us a call or send us a message. We are here to help. Al's Taping Tools & Spray Equipment815 Tower DriveMedina, MN 55340