Pentax 67II external power supply?

I know they made an external batter thingy for the 67 but I'm interested in one for my 67II cameras which take different batteries. Anyone make one or use one?
I was thinking if I had a spare battery compartment cap that I could make a dummy cell and screw it in with wire leads exiting the cap. Hook that up to a 6 volt battery and be good to go. Long exposures w/o replacing the batteries is the goal.
thanks
vinny

If the goal is to eliminate battery drain during long exposures there's no need for an external power supply. Just below the MLU switch on the 67II is a sliding lever marked "PS. TIME". It works like this: When you're ready for exposure, lock the mirror up, then slide the PS Time switch forward. When you open the shutter this mechanism will hold the shutter open, eliminating any battery usage. When you want to end the exposure, simply slide the lever back. I do a lot of long exposures myself, and I wasn't aware of this feature when i first started using the 67II. It's a great feature and really extends battery life for those that frequently use long exposures.

I read somewhere that pentax added a feature that allowed that but I didn't know how to do it til now. So it uses no battery power whatsover when the p.s. lever is engaged? That'd be sweet, I've always wondered what that lever was for! I'm still interested in the external power supply as well.

With the PS lever engaged no power is used. The battery powers the shutter actually opening, but that's it. Since I discovered this my battery life has increased tremendously.

Thanks! I did a 9 hour exposure earlier this month and it worked just fine.