i have just made this one up , using the original zodiac launch wheels and some ally and timber i had in the shed , sort of a transform on legs and wheels works really well with my 25 mariner and 15 yam even up and down the steps onto my decking
for the studs at the bottom i used 8mm coach bolts with penny washer behind ,which leaves the square nut behund the head for the slot in the wheels to slide and locate over works perfectly
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