Nitrous Oxide - Rebuilding Nos cheater solenoids

I have been trying to find out how to get to the plunger on NOS cheater solenoids to inspect it. I can get the coil off but after that I'm not sure . With my Dynotune solenoids you can unscrew the post with a screw driver. DO they make a special tool to get to the plunger on these solenoids. Thanks

The two little dimples under the coil is were you unscrew it you will need to buy or make you a tool to turn it,Be careful there is a o-ring under it

This is what you will need to take the solenoid apart

http://www.nitrousoutlet.com/catalog/product_details.asp?group=23&model=90&dept=11&product_id=1515

-Chris

Thank you for the link i was having a hard time finding that tool.