Another suggestion:
Run the end of the tube on a rotary wire brush to get it really clean.
Then apply soldering paste and put a coating of regular solder on the part that inserts into the block, this increases the diameter a bit.
You don't want gobs of solder on it, just "tinned"
Don't get it too hot, just warm/hot enough to melt the solder.
If you get too much solder on it, just heat it up a little and wipe it off with a damp rag.
Then apply your favorite sealant like permatex #1 or 2 ( I don't like silly cone)
insert it into the block and tap it in with a hammer on a block of wood.
Take care not to damage the part that receives the dip stick, also taking care not to get wood into the hole.
This is not the time that "wood" in the hole is good.
