Torsion spring tensioning tool

Torsion spring tensioning tool (100) for tensioning a torsion spring of a counterbalancing mechanism of an overhead door, wherein the torsion spring tensioning tool (100) comprises a housing (80) and a gear wheel arrangement (20) adapted to be mounted on a shaft of the counterbalancing mechanism, said gear wheel arrangement (20) comprising a gear wheel (21) rotatably arranged in the housing (80), the torsion spring tensioning tool (100) further comprising a gear mechanism (54) coupled to the gear wheel (21) for rotating said gear wheel (21),

• wherein the gear wheel arrangement (20) comprises a first engaging arrangement (32) and a second engaging arrangement (60) each being arranged to be fixed relative to the gear wheel (21),
• wherein the first engaging arrangement (32) is adapted to engage a first corresponding engagement interface associated with a first type of shaft and counterbalancing mechanism and transmit a rotational movement from the gear wheel (21) to the torsion spring of said first type of counterbalancing mechanism, and
• wherein the second engaging arrangement (60) is adapted to engage a second corresponding engagement interface associated with a second type of shaft and counterbalancing mechanism and transmit a rotational movement from the gear wheel (21) to the torsion spring of said second type of counterbalancing mechanism.