interested, gotta link to the halfords one?
Topeak 2-up: http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_952689_langId_-1_categoryId_242557
There's also this one, first time I've seen it but it looks like it doesn't need to be screwed in anywhere (sproingy base): http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_952599_langId_-1_categoryId_242557
That gravity rack cake posted looks ace.
@bothwell started
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Topeak 2-up: http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_952689_langId_-1_categoryId_242557
There's also this one, first time I've seen it but it looks like it doesn't need to be screwed in anywhere (sproingy base): http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_952599_langId_-1_categoryId_242557
That gravity rack cake posted looks ace.