My dad had the same problem with an Alan frame. A friend re-glued it with 2 component glue for aluminium. Indeed he fixed and pressed the lugs for days. You can give it pressure by using a piece of hard foam and clamps.
@SimplexNL started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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My dad had the same problem with an Alan frame. A friend re-glued it with 2 component glue for aluminium. Indeed he fixed and pressed the lugs for days. You can give it pressure by using a piece of hard foam and clamps.