… The funnel needs to sit neatly in a hole formed by removing a circular section of the upside-down washing-up bowl (see "F" in photograph below).
Some latitude can be employed here - the hole smaller or larger to either raise or lower the top of the funnel into the bowl.
… There is often a slight rim on the underside of such bowls, which can be used as a marker, otherwise a circle of suitable dimensions will have to be marked. Cut out the hole using a sharp knife (care needed - suggest wearing heavy duty gloves). Retain the circular piece so cut out: it can be used as the steadying base for the measuring vessel - see later.
… The funnel is glued (initially) into the hole, making sure that the spout (" F' " in photograph above) drops vertically when the bowl is placed on top of the main bucket. Once set, reinforce & waterproof the join with a fibre-glass skin on the underneath side of the bowl (where it won't be seen in normal use).
… Tidy up any jagged edges that might have been generated, and if required, paint the construction. My funnel was a dirty white, so I painted it black, which made a nice presentation against the dark green of the bowl & the black of the bucket.
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