i dont have a lathe to do this so what im looking at to get 2 X 1200mm lengths of 25mm linear bar threaded i need a course M24 thread ,thread,thread length around 50mm one end and about 75-80mm the other.

i havent bought the rail yet case theres alternatives its for a shed injection moulder i just need to complete the top half assembley and planned on useing flanged bearings,it will be very simular to the one in the link but i cant make out how they have fixed the ends of the rail to the plate top and bottom so my plan is to screw the rail into the large bed plate at the bottom and use nuts top and bottom of the top plate.
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