What is the other valve on this mbc?

[squeak104]

I got this mbc from a friend. His dad bought two 1g talons and it came with them. I know the top thumb screw is to adjust the boost but what is the side screw used for? Also, what are the two phillips screws on the back for? I haven't seen one like this before. There are links below to the pictures. Sorry they aren't too clear. Thanks in andvance.

http://home.earthlink.net/imagelib/sitebuilder/misc/show_image.html?linkedwidth=actual&linkpath=http://home.earthlink.net/~squeak104/sitebuildercontent/sitebuilderpictures/sidescrew.jpg&target=_self

http://home.earthlink.net/imagelib/sitebuilder/misc/show_image.html?linkedwidth=actual&linkpath=http://home.earthlink.net/~squeak104/sitebuildercontent/sitebuilderpictures/screws.jpg&target=tlx_new

 

[Newlogics]

I got this mbc from a friend. His dad bought two 1g talons and it came with them. I know the top thumb screw is to adjust the boost but what is the side screw used for? Also, what are the two phillips screws on the back for? I haven't seen one like this before. There are links below to the pictures. Sorry they aren't too clear. Thanks in andvance.

http://home.earthlink.net/imagelib/sitebuilder/misc/show_image.html?linkedwidth=actual&linkpath=http://home.earthlink.net/~squeak104/sitebuildercontent/sitebuilderpictures/sidescrew.jpg&target=_self

http://home.earthlink.net/imagelib/sitebuilder/misc/show_image.html?linkedwidth=actual&linkpath=http://home.earthlink.net/~squeak104/sitebuildercontent/sitebuilderpictures/screws.jpg&target=tlx_new

Top screw is for primary boost adjustment, side for 'fine-tuning' (bleeder) and two screws in on the side are for mounting.