Mine are copper-made. But I really . I was thinking the 4 copper gasket were too much crushed..? I will try to anneal them.
"Looping the line" is the technique I heard of that consist in removing the belt and letting the liquid flow in the rack
I red this expression here
http://forums.turbobricks.com/showthread.php?t=242298
But..I dont know how to do it, because the holes on our 240 racks are drilled, on an even surface, so how could I put a hose...?