How to Adjust a Shimano CSO-100 Fishing Reel

How to Adjust a Shimano CSO-100 Fishing Reel
Your Shimano CSO-100, or Callisto, features a smooth drag system that allows you to put the pressure on your fish without the risk of breaking your line because of a sticky drag. The Callisto's free spool mechanism has a fine level of adjustment so you can make your longest cast without the worry of a backlash.


Difficulty: Moderately Easy

Things You’ll Need:
  • Shimano CSO-100 Fishing rod Casting weight Hook
  • Shimano CSO-100
  • Fishing rod
  • Casting weight
  • Hook
Step 1
Mount your Shimano reel on your fishing rod. The reel sits on top of the fishing rod when you use it, with the reel handle on the right hand side. Unlike spinning reels that are meant to hang underneath the fishing rod, conventional reels like the CSO-100 are kept up on top of the rod when in use.
Step 2
Fill up your reel with line. The CSO-100 Callisto reel by Shimano holds up to 170 yards of 10-pound test monofilament line. To fill your reel, feed the line through the guide closest to your reel, through the level wind guide on top of your reel and tie it to the reel. A screwdriver can be used to hold the spool of line between your feet. Let the spool of line spin while you crank it on to your reel. Use your thumb and index finger to keep pressure on the line as you load up your reel.
Step 3
When your reel is full, cut the line with nail clippers and pass it through the rest of the guides on the rod. Tie your casting weight to the end of the line.
Step 4
Adjust the cast control. Part number 2994 on the exploded view parts diagram for the CSO-100 is the cast control knob. This knob adjusts the amount of tension on the reel spool when the reel is in free spool and you are ready to cast. If the reel spool spins at a rate faster than the line coming off the reel, the line quickly builds up, creating a backlash. The cast control knob eliminates that problem.

To adjust the cast control, hold your fishing rod out parallel to the ground with a weight hanging from approximately six inches of line. Tighten the cast control knob and then depress the thumb bar, taking the reel out of gear. Loosen the cast control knob until the weight begins to slowly descend. You are now ready to cast with that weight. This process must be repeated if you change the weight of the sinker or lure you are casting.
Step 5
Cut off your casting weight and tie on a hook. You can adjust the drag on your Shimano CSO-100 by simply tying on a fishing hook and using a stationary object to pull against while using the star drag--part number 2993--to tighten or loosen the drag as necessary. Hooking your line on a fence or similar object is a great way to get a feel for just how much pressure you can put on a fish without breaking the line.

Think of your reel's drag system as its brakes. When you apply the brakes in your vehicle, it slowly comes to a stop. If you jam on the brakes all at once, chances are you will skid and quite possibly hit something. The drag system on your CSO-100 is meant to slow your fish down--not stop him dead in his tracks. Setting the drag on your reel too tight is like jamming on the brakes in your car.

Tips & Warnings

When setting your drag, err on the side of too little drag. You can always add a little extra drag by applying light pressure with your thumb against the spool when fighting a fish.
After adjusting the cast control knob on your reel, make your first few casts conservatively. By gradually increasing distance, you can make needed adjustments before creating a backlash.

Article Written By Stephen Byrne

Stephen Byrne is a freelance writer with published articles in "Nor'East Saltwater," "Sportfishing" magazine, "Pacific Coast Sportfishing" and "Salt Water Sportsman." As a fishing charter captain, he was also interviewed for a feature in "Field and Stream." Byrne studied environmental science at the State University of New York at Delhi.

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