alot of leakage or what looks like a leak is fuel comming out of the breather and the fuel weathers off leaving the oil behind.
Solder will not stick to the carbs body you might be able to rough up the carbs body around the tickler and use 5 minute jb weld to seal it up but it will look nasty.
I do know that the brass fuel inlet has a red gasket under it and all of the engine kits I played with the fuel inlet nipple was not tight.
Something else if you think your float needle is full of trash you can take that nipple out and clean the seat of the float as it doubles as the floats needle seat. so sometimes you don't have to take the float bowl off to clean that part.
If the fuel IS coming out the tickler your fuel level is too high, which means your float is set too high, or it is sticking. I have seen a post where a screw is put in the hole to seal it up, which will solve your fuel leak thru the tickler, but I would venture to guess it will come out thru air filter next. A properly set float will NOT allow the fuel level to raise up to the tickler button...
You bend the arms to raise or lower the float level. The other thing you might want to check is if the float has gas in it, if it does it is leaking.
Norman always does the best job. Here is the post.........