Well, yes, but for 20 dollars I would have bought it even if the barrel was plugged to the muzzle. These little rifles are unknown in my land, and this little rifle seemed much more elegant than my Haenel 310.
I believe the part would be part of Nr 18. "manschettenschraube, geloetet", except mine is no longer soldered. The large part where the piston seal lies is still on the piston, and the tube is stuck in the barrel. I don't think I exceeded the melting point of lead at any point. The darkend surface of the little tube, visible through where the balls enter the barrel, showed that it has been stuck a long time in that position. The crap in the bore showed that somebody else had made an effort to unstick it in the past, if it had been very loose I think it would have moved.
Looking down the works, I can see the end of the block the barrel is mounted in - it looks a little silvery...but I cannot tell if it is tinned with solder, or if it is simply just not blued.
I don't plan on heating it enough to change the hardness, even if I did, the rifle is useless at this point. I was hoping for a little differential in expansion to help me break the tube loose.
As for heating a rod to slide down the bore, this won't work well for melting any lead that may have fused. The rod looses too much heat, cooling off so much it won't hardly char wood.
The acid idea is good - tell me what you use - I may give it a try.
I think I'll have at it a little longer with the rod Down here, if I just lay it in the sun a little. it'll get to about 45 degrees in no time, while the insides are still 25. This may help....every little bit helps.
Thanks for you reply!