TM 9-2350-277-20-4REPLACE COMMANDER’S CUPOLA VISION BLOCK LOCKS AND SEALS (M1064A3ONLY) — Continued0491 001. Remove thumbscrew (1) and spring (2) from periscope clamp (3).2. Remove bolt (4), washer (5), and periscope clamp (3) from post (6).3. Remove post (6) and washer (7) from cupola.4. Scrape seal (8) from vision block opening.0491 00-2
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