I am still looking a tool that can work such as LINEAR ACTUATOR to push a object in small size tunel. I need a tool with 2mm BORE, 2 mm contracted and approx. 7mm extracted ROD (more 3 times of contracted Rod). This is the crazy point
I am happy to use both AIR or Electric Power so some names of such tools can be listed such as Mini-Space Telescopic cylinder, Linear Actuator, Megnatic linear cylinder, Telescope Magnetic Cylinder, ....
A special tool I found is SMAs coil springs, BioMetal, .... that is created by mixed materials.
So please let me know if you have a look such tools anywhere.
THE LOW PRICE is much considered!!!!!
Enclosed pics:

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