Oldfeller--FSO
Serious Thumper ModSquad
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Hobby is now "concentrated neuropany"
Posts: 12671
Fayetteville, NC
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The fork lock is tough, nothing sold in America works without changing the smaller slot on the back side of the key to a square bottom format like the original german blank had.
You can start with an Axxess #93 blank, get the overlong thing cut to match the existing key blank (indexing both off the stop shoulder up near the round end) with the overlong waste stock sticking out the end of the newly formed key like an unnecessary metal blob right at the end.
Cut/grind the blob off and take a fine detail file and form the end of the newly made key to match your original blank for rounded form and length.
Then go pick a correct width/tooth form cutsaw blade and hand draw cut the small tapered bottom slot to a square format. Draw cutting is putting a tooth or two at the tip of the new sharp relatively long coarse cutsaw blade into the slot (pick a coarse blade that will be as wide as the cut needs to be to match the old key's slot) then pull the blade to you by hand, ripping a single curl scratch cut into the tapered shoulder of the existing slot. Repeat as many times as needed.
Scritch-rip, scritch-rip, scritch-rip ....
Hand skill is needed to do this -- you can file it by hand but it would take like forever with a thin enough file. You can dremel it, but control is tough using a square bottom rotating cutter and the wheels aren't the right width unless stacked (and they load up quick with the soft brass). Hand draw cutting with the correct width and tooth form of cutsaw blade is much quicker and cleaner.
Repeat the hand draw cut motion as needed, it goes quicker than you would think as all you need to is create enough "square bottom" to the slot to allow a form plate/pin to freely go down the slot which then allows the shape of the key machine cut form to actuate the tumblers. You only have to flat bottom away the high side of the tapered slot that is there already, not much in the way of additional depth is really needed after the correct width and square bottom form is achieved.
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Now, as soon as somebody finds a correct blank for this fork lock we won't have to do all the fine fiddly work on the slot and tip, essentially reforming the whole durn thing because the Axxess #93 blank isn't really quite the right blank for the job.
The Germans did this on purpose, you know -- revenge on their failed Japanese allies and on us Yanks for WWII !! Scritch-rip, scritch-rip, scritch-rip .... hee hee -- that'll fix them!
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