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many thanks for replying torben i am a total novice with electronics but will try to explain i am building a Focke Wulf 190A/8 RC model of 15 foot span with a weight load of about 75Lbs the retract mechanism need to move a leg of about fifteen inches long in towards the fusalage the leg will weight about three quaters of a kg i would like to move it with a screwjack but dont no how your help would be much appreciated dave