Gundlach Radar Anastigmat F4.5 8x10 Lense

[junbug75]

Hi,

Just got a new 8x10 (B&J Commerical View) and it came with a Gundlach Radar Anastigmat F4.5 8x10 lens in a Betax No.5 shutter. Two questions:

1. The T and B seems to only work sporadically. The other shutter speeds seem off. Is the shutter serviceable and is it worth it?
2. I was wondering if the lens is complete. I see a front element (screwed onto the shutter front) and a rear element (screwed onto the back of the shutter). Could it be missing anything?

Pic attached.

Just trying to learn about these fascinating older lens.

Thanks for any insight!

J