rotary switch question

[Seven64]

so i have never used one of these before, but my buddy wanted me to build him a clone of the DBA robot.  i am at the point where i have to wire it up, but i think i got the wrong switch.  the one i have only has 1 pad in the middle instead of 3/4.  it appears that all it does is take pins 1, 2, and 3 to ground independently.  i was wondering if i could wire the first 3 outer pins to the holteck chip, and the inner "a" pin to ground, then set it to only 3 positions.  

i think this would work, but i cannot find any information on google about the switching mechanics inside the actual switch.

**edit**

http://www.freestompboxes.org/viewtopic.php?f=7&t=12112&start=120

link to the project.  and yes, i am asking the same question there, but the community here seems much more helpful and friendly to noobs

[Seven64]

nobody?!   

[R.G.]

The link is malformed and leads nowhere.

In general, you can figure out what connects to what in any switch whatsoever with a pencil and paper and a continuity checker to test what is connected to what at each position of the switch. Switches may be complicated, but a good sketch and a continuity checker and some time spent with it will tell you everything about it.

[Seven64]

i always forget about the tools on my bench, and how helpful they can be.

i think a continuity tester might just do the trick 

:leaves with tail between legs:

[deadastronaut]

like rg said, i had to do that a while back...no other way to know for sure...

http://www.doctronics.co.uk/gt_4.htm