procurement of spares of sky climber ( movable platform ) make sky climber , model alpha-800 used in the boiler furnace for internal inspection at unit no 3 and 4 of 2x660 mw units, mppgcl, dongalia , rope guide ring , departure guide , shaft excentre , guide washer , disc spring , flat spacer , locking plate , pressure bolt , seal ( part number 52008266 ) , seal ( part number 52008265 ) , seal ( part number 52008277 ) , ball bearing ( part number 26008548 ) , ball bearing ( part number 26008529 ) , needle roller , traction sheave gearbox alpha 800 , spring , pressure wheel, sky lock ii , left hand jaw sky lock ii 9 mm , right hand jaw sky lock ii 9 mm , lever, trip , pin ø4x24mm din 1481 , pin ø2, 5x16mm din 1481 , spring, trip lever , lever, reset , lever manual trip , main spring , sky lock ii - 9 mm over speed safety device , connection blocks, set of four