That reminds me, I once threw an Svea 123 off a cliff because the only meal I had left required cooking and the stove would not operate. I was hungry, and annoyed! I had to recover the stove, don't like to litter, and upon closer examination at home, it was discovered that the burner tip was cracked from overtightening when cleaning. That was the old design that had to have the tip removed and reamed out regularly. I had over tightened the little brass tip! Live and learn.
Probably a little late with this, but you shouldn't have to remove the jet (the brass tip) to clean it. The pricker wire can be inserted from above. If the jet is really dirty, then you might need to remove it for additional cleaning.
A lot of people prefer the old style 123 over the newer 123R even though the original 123 doesn't have a built in cleaning needle. The original 123 has a lot more turn in the valve and is easier to adjust. It also burns a bit better without the needle inside the jet. Some people even go so far as to remove the cleaning needle on a 123R so that it will run better.
HJ