Hey Serenity,See my post about Tuning the Galatian lower on this same page. It's a bit of a pain, but the preload is adjustable. You need to remove the butt stock and butt stock retaining plate from the receiver (to see the hole) where you use a 4mm Allen wrench to adjust.The preload on my gun came backed out about 1/2 way, so screwing in (clockwise) lessened the tension on the hammer spring.Kirk
Hey Serenity,What your pic shows is the set screw is already turned in too far making the spring about as loose as it can be.To de-tune the gun further (using just the spring), you need to get a longer, but weaker spring to reduce hammer strike.However, most importantly, I would recommend plugging (5) of (6) valve holes to reduce air flow. The Galatain's problem, is that it's built for a .25 caliber platform and is an air hog -> even at that caliber. The gun is very loud and inefficient out of the box. IMO the hammer spring really doesn't need to be changed out, the more important issue is reducing to gun's airflow.I have my .177 tuned for CPUM (10.5 grains), I probably get 100 shots per fill at 850 fps to 1000 fps over the unregulated curve. My gun is pretty quiet now with just an air stripper. I will add a regulator soon. My ideal tune (goal) would be 85 shots at 950 fps using CPUM. Good Luck....................Kirk
Hey Serenity,Yes Your gun has to be loud! That's wasted air on each shot, as air is coming out of (6) valve holes instead of (1). Matter of fact the (1) is too big, but I wouldn't restrick further. When the extra valve holes are plugged and filled with JB Weld, the gun will be MUCH more efficient and increase your already good shot string . See rstern's (Bob's) post from August 2012 on Tuning the AT44 Long in .25 cal. He gives step by step pics of the tune. Remember, the hammer preload adj. is different on the Galatain. IIRC, the Galatian with (5) of (6) valve holes plugged can shoot a CPUM (10.5 gr) at over 900 fps at 100 bar. So the regulator's set-point can be pretty low, you then can adjust to get more or less hammer strike using the pre-load adjustment with OEM spring. So this gun gives you 100+ bar of a 255 cc air cylinder - minus the regulator / plenum for the shot string IMHO, the key to tuning this gun is airflow; the gun will also be more fun to shoot as you can take off the ear protectors.Lastly, did you install the regulator? Plugging the valve holes is not that difficult, but can be overwhelming for someone who is unfamiliar with such work.Do what you feel comfortable with........... Kirk