TM 9-2350-277-20-4REPLACE COMMANDER’S CUPOLA VISION BLOCK LOCKS AND SEALS (M113A3 ANDM1059A3, M58 ONLY) — Continued0490 001. Remove thumbscrew (1) from arm (2).2. Remove spring pin (3) from arm (2). Discard pin.3. Remove arm (2) and washer (4) from cupola bracket.4. Scrape seal (5) from vision block opening.0490 00-2
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