CMC is including a nice little tool with their 1/18 releases now, they still have the old pick style tool in the package but now they have a nice tool with a small suction cup on the end of it that grips and pulls the hood, door or trunk open so you don't have to push a solid object between body lines to open something. I don't think they sell this separate but if you can find a small suction cup like this one you could use it as well. This tool is a really big help when you have tight tolerances to keep you from having to force a pick into a body line to open a hood or door ect.
For anyone interested in a suction cup tool to open their diecast hoods, trunks and doors here is a bellows style suction cup that is a little smaller than the CMC tool, the CMC tool measures 1/2 inch across while this one would be .39 of an inch across. You can use this as a search to find them on eBay.
Clear Silicone Waterproof Vacuum Suction Cup 10mmx5mm Bellows Suction Cup,4pcs
I like the bellows style even better because you can release the suction. These are $8.98 with free shipping from china.