How to force Airport to join an AP with weaker signal?

I'm trying to figure out if there is a way to get the Airport card in my MBP to join an access point, with the same SSID as another access point, but that has a weaker signal?
Say there's 2 access points (A and B) and they both have the same SSID (eg. Wayport_Access). A is on channel 11 and B is on channel 1. A has the stronger signal. By default, and normally, you would want the airport card to associate with the access point with the best signal, A in this case. However, I'm in the situation that A is not functioning properly. So I want to join, B, even though it's farther away.
I've tried using iStumbler to force a join with the B access point on channel 1, but nothing happens. I stay on A as long as it's the stronger signal. If I move such that I get to a place where B is the stronger signal I can then get iStumbler to get the Airport card to associate with B on channel 1. If I then move back to my original location where A is the stronger signal I do stay associated with B, which is good. However, due to hotel positioning and such, it's not always convenient or even physically possible to move to a position where the B signal is stronger.
I thought I remembered an advanced setting somewhere that would allow me to set something about stronger/weaker signal setting but I cannot find it in Sys Prefs.
Any ideas?
-Rich

LarryHN wrote:
do you have the air port icon displayed in your top menu bar - if not add it in the system preferences ==> network ==> airport?
Yes.
Click on it and click join other network then sow networks and click on the one you want to force to - that should do it
Not if both Access Points have the SAME SSID, there's the catch. There's no mechanism through the Airport Menu or System Pref to join a different access point with the SAME SSID. That's why I was using iStumbler, because it will show ALL available access points, even the ones with the same SSID, based on which channel they are on. I want to associate with the access point that has the weaker signal, but has the same SSID as the access point that I'm already associated with. If IIRC there used to be an advanced setting about signal strength, but I can't find it anymore.
-Rich

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<Edited by Moderator>

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