Chick Mailey built the Unit 23 park in a former whisky warehouse in Dumbarton to give his sons somewhere safe to go.
The park’s 8,000 members now flock from all over Scotland to use its massive ramps and bowls at weekends.
A study by Strathclyde Police found the park, which has received no public funding, reduced youth crime by 35%.
Mr Mailey said he insisted on a “code of honour” which required youngsters to leave any territorial or gang affiliations at the front door before they were allowed in to skate, BMX or roller blade.
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