If those Chirin's can be opened up then it looks like all they would need is some added weight and the proper 'push' coupling and it should hold the rails a lot better. Weights inside like these https://www.ebay.com/itm/Weights-Self-St...XQnYJQ9pjC or these https://www.ebay.com/itm/1-4-oz-7-gram-W...Sw1WJZLeyI should work as long as there is room inside the shell.
The Vicarage Orchard ~ Super's Motorized tendered Chirin run
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