Set 146
The collaboration with Neatorama continues this week, Alex is posting another of my photos and once again offering a t-shirt for the correct answer. His web site is one of the few that I visit every day, if you enjoy surfing the web, it's a great place to start.
835. Approx. 8" long:

836. 10-1/4" long:

837. The box is 12" long and 6" wide with a divider in the middle to make two compartments, the top piece can slide to cover either side:

838. 5" long:

839. Partial shot, 1-1/2" diameter:

840. 4" long:

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The owner of an unidentified tool sent in a link to a page of photos of it, maybe someone here will recognize this one.
Answers
Last week's set is seen below, click here to view the entire post:

More discussion and comments on these photos can be found at the newsgroup rec.puzzles.
835. Approx. 8" long:

836. 10-1/4" long:

837. The box is 12" long and 6" wide with a divider in the middle to make two compartments, the top piece can slide to cover either side:

838. 5" long:

839. Partial shot, 1-1/2" diameter:

840. 4" long:

-----
The owner of an unidentified tool sent in a link to a page of photos of it, maybe someone here will recognize this one.
Answers
Last week's set is seen below, click here to view the entire post:

More discussion and comments on these photos can be found at the newsgroup rec.puzzles.