Self-locking nut

Listed on the following equipment:
Technogym - Anterior - ME05 | ME15
Technogym - Bike XT (D220U)
Technogym - Bike XT (D221U)
Technogym - Excite Line - RE3 New Recline DAD - 700 (DAD73L)
Technogym - Excite Line - RE3 New Recline DAD - 700SP (DAD74L)
Technogym - Excite Line - RE3 New Recline DAD - WTV Digital TV (DAD73D)
Technogym - Excite New Recline (DAD5/7)
Technogym - RE1 New Recline 700 Old Seat - DAD (DAD33W)
Technogym - Recline XT (D260U)
Technogym - Recline XT (D261U)
Technogym - Rotex 600 XT Pro - D375
Technogym - Rotex 600 XT Pro - D375C
Technogym - Rotex 600 XT Pro - D375CU
Technogym - Rotex 600 XT Pro - D375U
Technogym - Rotex 600 XT Pro - D377
Technogym - Rotex 600 XT Pro - D377C
Technogym - Rotex 600 XT Pro - D377CU
Technogym - Rotex 600 XT Pro - D377U
Technogym - Rotex 600 XT Pro - D380
Technogym - Rotex 600 XT Pro - D380C
Technogym - Rotex 600 XT Pro - D380CU
Technogym - Rotex 600 XT Pro - D380U
Technogym - Rotex 600 XT Pro - D385
Technogym - Rotex 600 XT Pro - D385C
Technogym - Rotex 600 XT Pro - D385CU
Technogym - Rotex 600 XT Pro - D385U
Technogym - Rotex XT (D280U)
Technogym - Run 600 XT Pro
Technogym - Run XT (D241U)
Technogym - Run XT (D242U)
Technogym - Run XT (D243U)
Technogym - Run XT - D240U
Technogym - Top 700 - D4773L - 2.0 (S/N D4773L08000161-Below)
Technogym - Top 700 - D4773L - 2.0 (S/N D4773L08000162-D4773L08000362)
Technogym - TOP Upper Body Trainer - DA7 (DA773W)
Technogym - Top XT (D270U)
Technogym - Top XT (D271U)
Technogym - Vario 700 DAF73L

* Images may not be identical to part.