[GreenKeys] More on the LPR hammer?

[John, W9DDD]

OK, I can see from bulletin 1167B the original hammer looked quite 
different.  Part number 156476.  Has anyone ever seen this version? What 
was it made of? Was it just all metal?

http://www.navy-radio.com/manuals/tty/1167B-5903.pdf
PDF #40 (page 2-16)

Then apparently there was a design change and a modification kit 176318. 
  That included 173980 hammer and 173979 head, hammer and some other 
related parts.

http://www.navy-radio.com/manuals/tty/1167B-6103.pdf
PDF 54 (page 2-9)

So the hammer head in the pictures of the parts bulletin is rectangular 
as are the ones I have. The photos Nick referenced
http://www.navy-radio.com/tty/lpr-hammer/
show a hammer head with a couple of chamfered or beveled edges.

The question, did they revise the design without changing the part 
number?  Does some other 28 gear use a similar part?  The parts I have 
have been through 3 hands, so can I trust the bin being marked as 173979?

-- 
John, W9DDD