Key for internal nipples

outcastjack
outcastjack Posts: 237
edited January 2013 in Road general
I recently bought a second hand wheel with spoke nipples reccessed inside the rim. the only way to get at them is by removing the tyre and rim tape however after doing this i still am not able to get any tools in to true the wheel. I think the nipples are standard 4mm square ones. does anyone know of a tool designed for this ?

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