Tandem Cycling - Bottom bracket -

I (we) just purchased a Burley Rock n'Roll tandem - and have taken the bottom brackets and all apart.
My question -
I expecting the rear bottom bracket (the one under the stoker: main drive bottom bracket?) that it should be a threaded bottom bracket similar to road and mountain 1/2 bikes. (see that? I'm picking up the lingo already). I found the bottom bracket held in by cir-clips. Is that right?
thanks in advance for your help.
Rev.

That is probably correct depending on the year. Furthermore, there maybe Loctite holding the bearings in place. I have a '93 Bossa Nova and didn't know about the Loctite. It took a tremendous amount of force to get the bearings out (big vise and cheater bar). Heat should break loose the Loctite if they used bearing retainer Loctite. Hopefully someone else can add more thoughts on getting them out. The bearings are standard and readily available. There is a spacer between the bearings on my model. Tandems East has pictures to help you understand http://www.tandemseast.com/parts/brackets.html . Hope this is helpful.

Yes, up and until around 2002/2003 (?? not positive on the year off the top of my head) Burley used pressed-in bearings for their bottom brackets. While not at all common nor as user-friendly as threaded bottom brackets it was an excellent design choice that holds up well. The bearings are pulled and pressed-in just like any other pressed-in bearing installation.

thanks much.
I'm just gathering information at this point - info that will be most helpful if/when I run into any kind of problem.
thanks for helping a newbie out.
Rev.