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Tongue Jack Flex-Fin Ground Foot Shoe
A 100 mm wide replacement ground shoe for trailer tongue jacks with a cracked or missing plastic foot. Eight angled flex fins inside a 56 mm socket grip round jack feet or inner tubes from 44 to 52 mm. Eight gussets carry the load into the base, there is an 8 mm drain hole, and four 5.5 mm holes let you lag-screw or stake it to a plywood pad.
Flex-Fin Car Cup Holder Tumbler Adapter
A stepped plug that sits in a car cup holder and holds a big 40 oz tumbler. Its 64 mm core has eight angled flex fins that reach out to 77 mm, so it wedges into holders from about 66 to 76 mm across. The 94 mm cup on top has eight inward flex blades that grip tumbler bases around 85–89 mm, and the tumbler rests on a 45° funnel. Because the fins bend on both sides, it fits a range of holders and tumblers instead of just one brand's exact diameter.