20 Most Recent Stanley CT10C Heavy Duty Staple Gun/Cable Tacker Questions & Answers

Sounds like you have a staple jammed in it , so the hammer is stuck.

As far as I can tell this unit does not have an adjustment. Normally such an adjustment would only be included on much more expensive and specialised units generally listed for professional use.
If you need more pressure then hitting the tack with a hammer is the general answer.
If you need less pressure, i.e. the tack is cutting through the insulation/wire you are tacking then a cushion may help.
Suggestions for cushion material include one or more layers of paper or a thin (e.g. 3mm) piece of neoprene foam. After tacking the wire in place the foam/paper can be removed almost completely to produce the desired result - a tacked wire with no damage.
Hope this helps. For more power I favour the Stanley PowerShot series: they are absolute brutes and shoot most variations of staples, tacks and nails.

Look at the above picture of the stapler and follow the bottom of it from the left side over to the right side. Right there on the end of it is a small piece of metal that looks bent down, bull this out and set your row of staples on top of the sled you pulled out and then slide it back it. it is ready to staple something.