I always laugh at the size of the kite poles that come with some old racer/cruisers!
first thing I do is chuck them out order x2
www.whitworths.com.au/spin-pl-end-rf-50mm?q=80655 and 3.5 meters of aluminium tube to suit. Apparently I could only buy the tube in 8 meter lengths so half went to my mate and half to me.
i connect the end to the bowline of the jib sheet and then tie a bowline onto the jib sheet with my preventer line and flick it up to the pole end and then pull the preventer line forward to my bow cleat. Works for me.