"CHUCK"Hey guys here is a copy of "Troubleshooting the FX Wildcat" for you...on the fourth and fifth page you will discover why you will need a pair of calipers if you ever take your Wildcat apart. When you loosen the four screws at the bottom of the barrel support brackets to remove the air tube you will find that you are able to move the assembly forwards and backwards...in doing so you are unknowingly moving your feeding pin aka pellet probe which causes the transfer port hole in the probe to be out of alignment with the transfer port hole in the barrel. To make sure you have the pellet probe aligned correctly each time you put the gun back together you need to measure the depth of the probe and follow the directions to reset it if necessary. If I were you I would take a measurement of the probe depth with your calipers before you take it apart for the first time.
This is why some guys have problems after installing a new Huma regulator in their Wildcat...they put the gun back together with the probe slightly misaligned and can only get 650 to 750 ft/s velocity out of it. Not realizing the misalignment is partially blocking the barrels' transfer port hole which causes the reduction in velocity. If you didn't know this you would go crazy trying to figure out what the problem is and wrongly assume it is your Huma, when in fact you are the cause of the problem. After loosening the four screws in the barrel support brackets place one hand on the barrel shroud and one hand on the butt stock and pull and push and you will see what I am talking about...look at your trigger moving back and forth as you are doing this for a visual reference. You will readily see the amount of movement...then also while pushing and pulling the assembly take a look at your pellet probe and see what this is doing to it.
Most of the Wildcats come with the assembly set so that the front of the cheek rest just touches the rear barrel support bracket. But you cannot count on this to set the depth of your pellet probe because the tolerance is just too close. The probe depth has to be set from 28.55mm to 28.8mm - that is only .25 millimeters of play in the setting - not very much at all. This is the whole secret to working on a Wildcat...and not one most tuners will tell you... so that when you get your rifle all out of shape you can hire them to fix it for you. Good luck with your project and remember to have patience with yourself...once the gun is put back together and the probe depth is set correctly you will simply adjust your hammer spring nut to adjust the spring tension to accommodate the new regulator setting...and discover why I say the Huma regulators are Elegant in their Simplicity.
All the best, Chuck
http://www.airgunbuyer.com/Troubleshoot%20fx%20wildcat.pdf
