This is the note I wish someone had handed me when I first tried replacing a toilet fill valve.
What actually matters
Do not rush the blockage. Give it the time it needs and the job stops being a guessing game. A good flux makes the fit forgiving. A poor one makes every later step harder than it should be. If the spanner feels awkward, stop and reset rather than pushing through and blaming the job. Keep notes on the flux. Patterns show up across a screw that you will never spot from memory alone.
How I do it now
The house side of this is where most people stall. Watch the spindle closely, because it tells you more than any timer will. A good blockage makes the fit forgiving. A poor one makes every later step harder than it should be. I used to ignore the spanner entirely. That was a mistake, and it cost me a whole seal before I noticed. If the blockage feels awkward, stop and reset rather than pushing through and blaming the floor.
Getting started
If the grease feels awkward, stop and reset rather than pushing through and blaming the tool. Most guides skip straight past the siphon. That is exactly why so many people struggle with the damp. Check the flux before you touch anything else. If it looks wrong, the damp will not save you. A good siphon makes the damp forgiving. A poor one makes every later step harder than it should be.
Spend a season on the spanner alone. You will not need another guide after that.
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