This article describes a complete teardown of the Shimano Calcutta TE (CTE) reel for service and includes details on specific modifications that can be made to this reel to improve performance.  This article is highly technical and you should only attempt the steps detailed below if you are confident in your reel servicing skills.  Also note that the performance modifications are by no means recommended by Shimano and may affect your ability to have the reel serviced under warranty.  Shimano parts referenced in the article can be ordered by calling Shimano directly at 1-877-577-0600. 
 
Recommended Tools

1)    Small Phillips screwdriver – See tools image
2)    Q-tips
3)    Shimano oil  part number BNT1445
4)    Towel or rag
5)    Shimano grease  part number A-dra1/4  ( ¼ ounce size will do around 10-15 reels)
6)    Schematics of the reel [ CTE 400 | CTE 300 ]
7)    10mm wrench or nut driver or  the Shimano tool that came with the reel
8)    Small flat head screwdriver
9)    Toothbrush
10)   Rubbing Alcohol