Bolted a couple 1-2-3 blocks together and placed the original mag against the soon-to-be. This arrangement kept things relatively square while I marked the angle across the corner. The angle appears to be for ease of insertion into the mag carrier on the gun. Not shown: milled and finished the angle.
I set up the original mag in the milling vise and used it to set up the quarter round cut. The depth of this cut indicates the mag in the carrier. I used a depth micrometer set against the lower fixed jaw on the vise to position the work in the same location.
Used a 4mm end mill then test fit the mag in the gun. It was a good fit in the carrier. A bit tighter than the original.
Not exactly an epiphany, but I've been thinking a lot about how to mark off the pellet hole spacing on the mag. It occurred to me that I could simply remove the barrel...
and just use a transfer punch to mark directly though the breech.
Put some layout fluid on the face of the mag, then slid it home.
Lucked out and had a punch that fit the breech like it was made for it.
Tap, cycle the carrier manually. Tap, cycle the carrier...
Testing: Drilled some aluminum with various sizes of bits then tested .177 cal wadcutters in the holes. No real surprises here, but I settled on a #16 bit for final size.
A pointed indicator is used to locate the center of the hole...
then it's replaced with a bit and through drilled.
Then back to the indicator for the next hole. Slow, but it worked.
Opened the holes up to #16 (0.1770").
Used a #15 bit in a pin vise to chamfer the breech side of the mag to allow the pellet skirt to seat flush.
A small groove cut with a 1/4" ball mill marks the side to load.
Front view. Test firing was surprisingly uneventful. The darn thing functions and the pellets go into a little tiny single hole on the target--??? I am utterly astonished that this even cycles--let alone works. Oh, the bottom mag is the new one. I'm absolute proof as to the old saying about blind pigs and acorns.
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