I just built the Crystal Crawler, an official Power Miners combination of the Crystal Sweeper and Claw Digger! It is definitely the best combo set from the first wave of Power Miners,
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LEGO 8961 Power Miners Crystal Sweeper | BrickEconomy
NEW Lego Power Miners 8961 Crystal Sweeper 2009 Sealed Brain Meltrox Sulfurix 673419112819 | eBay
LEGO Power Miners: Crystal Sweeper (8961) for sale online | eBay
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8961 Crystal Sweeper - LEGO instructions and catalogs library
Crystal crawler Instructions - General LEGO Discussion - Eurobricks Forums
8961 Crystal Sweeper - LEGO instructions and catalogs library
Crystal Sweeper 8961 - LEGO® Power Miners - Building Instructions - Customer Service - LEGO.com SG
Crystal Sweeper - LEGO set #8961-1 (Building Sets > Power Miners)