The problem was that nothing extruded out from the right side to tap on and the spring was very strong and the wedge was way too tight. I use a plastic hammer and a screwdriver. I held gun in left hand, pulled down on spring with screwdriver in right hand while girlfriend tapped with hammer. The slot was just too tght.
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REPLY:
The spring (or round bottom groove) in the wedge and the screw (on barrel above wedge) are only to keep the wedge from getting lost after the barrel is removed. On a properly working wedge neither the screw or spring or groove have any influence on the final "tight" position of the wedge or ability to move the wedge to the left (loosen) till the barrel is removable. As suggested you need to get the wedge working properly first in order to have any fun with this gun. You may have a collection of miss matched (poorly fitted) parts. The wedge installed (left to right) ,(spring up), (spring end hook on right side) into the arbor slot (barrel off) should slide easily left to right and back, and stop with the spring hook on the right side and lip (thicker edge of wedge) on the left. The wedge should fit in the barrel (not on frame) with the same limits (spring hook to wedge lip). With a proper barrel to arbor fit (no wedge) push the muzzle and grip heel together, the barrel assembly should bottom out on the arbor and front of lower frame (two pins) with the proper forcing cone to cylinder gap ( 5 thousandths +- 2 thou or so). You should be able to assemble (no wiggle between barrel and frame) and remove the barrel and wedge with thumb pressure or at most moderate tapping. Assembled the wedge should be proud of both sides of the barrel rectangular slots.