Spanner? What, are you British now? It's a wre..... well you did say spanner wrench & not just spanner and a spanner wrench would be the appropiate tool to use.Hey man ! Don't hurt that thing . Use a spanner wrench on the adaptor . ( remember , presumed innocent until proven otherwise ) . How about an identical head with an R8 adapter ?
Haha, sorry Mike, but Dave started it! I was going to behave until you got this resolved but Dave triggered it & I just can't resist.