Haywards Heath under-11s were inspired to Sussex Minis Festival glory by first team captain Alex Meredith.
Heath secured their fourth county crown in five years with a 25-15 victory against hosts Lewes.
The evening before the final, Meredith, captain of Heath's national three south team, conducted a training session with the youngsters helped by hooker Huw Jenkins.
Under-11s coach Eric Walsh said: "It gave the lads a boost to receive tips from players they look up to and gave them an extra edge on the day.
"The club has a good junior and minis set-up and the senior players help out.
"It paid off this season because we have produced four county finalists.
"The secret of the under-11s' success is having talented guys who are good athletes and quick learners with a good team spirit. Positive parental support helped too."
A hat-trick of tries from Dominic Fry and two by Matthew Lasis sealed success. Tom Bowen scored three touchdowns for Lewes.
Last week Heath under-13s won the county title.
Heath under-16s lost 7-3 to Eastbourne in their final. The under-12s can complete a hat-trick of junior county final wins for the club this season.
Their final was postponed because Brighton had a fixture clash.
The under-nines' final between Crowborough and Chichester must also be re-scheduled.
Brighton under-12s won their age group at the Worthing Minis Festival.
They defeated Burry Port 5-0 with a William Duffell try in the final. It was revenge for a 10-5 reverse against the Welsh side in a bruising group match, when Duffell again touched down.
Brighton beat Beccehamians 20-5 in the semi-finals with Darion Naylor (3) and Harry Leonard scoring tries.
They won their quarter-final against Cobham on a toss of a coin after a 5-5 draw, Naylor scoring another try.
Brighton defeated Windsor II 30-0 (Naylor 2, Oliver Richards, Duffell, James Kinsella and Leonard) and Westcombe Park (Naylor 2, Craig Holland 3) in their other group games.
Brighton competed a hat-trick with two more wins at the Worthing Festival.
Their teams won the under-11 and under-nines' shield competitions with victories against Uckfield 5-0 and Beccehamians (Kent) 15-5 in the finals.
Crowborough beat Crawley 10-0 to take the under-11s' plate and their under-sevens defeated Beccehamians 10-5 in the Shield final.
Hove took the under-tens' plate with a 5-0 victory over Sevenoaks and Crawley the under-12s plate after a 10-5 triumph against Worthing.
Over 1,500 players from 16 clubs took part in the festival.
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