![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgCSa5yT627iW-1Q6L3mmu628Bk2v2xK6rC2FA791DSkYWPixod1xpSP1OlIscR6LCnfq-kdhzhpQd-kfimZJmIyQR56QNs8u59jcoszjOyF-4cs31Uuds5TBG2fBEyjafULj13_cAqkZo/s320/simpa.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhkKcsGG1f8JTwMvVuY0frlEZTQ_ceGw38gG-ZE1SZl-5gZLFEZmgZbVw-0vY2TiNoL0SiuHjrvuGmBE2EGBL8HeYGkbM8nTvHJYIYbiNuggFm3o4YJ5oeZGmHOzmM5rGy-_4Edt_cB_ls/s320/simpb..jpg)
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It doesn't matter if your problems involve determining the "small end of a reamer" or the "thickness of a Woodruf key size" the Simple-Fyer is the answer. Body Drill? Basic OD of a screw? Threads per inch or fine versus coarse? A cardboard disc with multiple circles, any Christmas problem involving sines, cosines, tangents, cotangents, secants or even CO-secants are no problem with the Simple-Fyer. This year, save time with Derck's. Only one dollar at all Cardboard Gauge Dial stores!
Derck's Gauge Dial, 1943. Collection Jim Linderman
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