Had this 30 years, light home use only on wood, never a problem. Loan to a friend who uses it to sand excessive drywall mud. No good deed goes unpunished. Blow it out, it still runs very noisey but obviously needs cleaning and regrease. Looks easy to disassemble - remove 4 bolts and both halves should separate - but they don't. Only about 1/2" opening. How do I completely open 2 halves without excessive force or breaking it?