It comes with a stainless nut but I would pick up a ss lockwasher too. Cut your original one piece rod with a hack saw just behind the cup head and then cut the threads for the rod to fit the new adjustable head. Just buy the adjustable head from MAC-1 for like $15. One easy one is to have the adjustable piston rod so you can maximize each strokes efficiency.Its an easy fix too. Yeah, theres some small details in the rebuilds that can make or brake it for top performance. Too many people are misguided with velocitys and willing to accept these new low figures. You can load a pellet and then push it back out with a 1/8" wood dowel to see if there are wear marks from burrs on the pellet.Shoudl be only rifling nicks evenly all around the head and skirt. Check the crown for damage.Also burrs at the trasnfer port. Now after you try those two best pellets if your gun cant put them in a 1/4" hole at 10 m thers other issues. Benj Cylindericals do not group that great with flyers. Ones that did not were FTS, Crow MAgnums, and Silver bears. When it comes to groups and accuracy pellet choice is important and Ive found out crosman premiers shoot the tightest equal or better than JSBs. In fact Ive had a few old ones over 45 years old stock that shot above 700fps at 8 pumps.In the ARH 1968 catalog page 22 youll see figures using the original heavy sheridan bantam pellets that weigh 16.25grain-take a look. You velocitys are low!! 8 pumps which is the manufactures maximum reccommended charge should yield between 650-700fps depending.
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