After trying various methods to install my one piece RMS and having them both leak, I bit the bullet and bought the proper tool off ebay a while back. This thing is pretty slick and worked like a charm. Worth every penny.
I only used it once and really have no further use for it.
$150 plus whatever they're charging for a medium flat rate box these days.
Paypal ok.

 

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I just don't understand why Kent Moore tools are so damn expensive. Like you said, they work great, but geez.