We have a number of vacuum chambers with pumps etc. below & cylindrical ovens that drop down from above. We load our products into the outer flanges for processing &, in the central flange, load an assembly which holds optics & materials that will be evaporated onto them to create semiconductor layers. The operators can usually lift the assemblies into position whilst someone starts fitting bolts to secure it.
We have a new product for which the assembly to be located in the centre flange will have a mass of around 40kg, too much for one person to hold in position whilst it is bolted up. We need some sort of jack to lift the assembly but it needs to be stable & able to raise straight up without deviating too much. Any suggestions? We do use scientific Labjacks but their footprint is too large at this load rating. The assembly being lifted will be very top heavy.
The surface to stand the jack is about 800mm off the floor & 830mm diameter but with obstructions. We need to lift about 300mm.

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