Ah, well..............
Having conquered a furious battle with alu - the production of
Ted Gladstone's exemplary Door Openers - after having made only four of each
of four samples. That's right - 16 faulty samples - a simple misread each
time. In one case I made two faulty samples one after another - and each a
copy of the original mistake..........!
FINALLY, after correcting these egregious errors, and coming out
with perfect silhouettes and holes all in one line, I have but to drill with
4mm in order to thread with 5mm. Out came the treasured metric tap/thread
set, bought with hard-earned Canuck pennies in emerging German industrial
toolmaking in Munich, 1956. Narex the trade name was. I knew I would need
them one day.
Then in a fit of completion, I bought a Swedish 5mm tap and on
inspection, discovered it said in TINY print, "WS" and down in one corner,
"Coarse Thread".
Oh-oh. I drilled 4mm on a scrap alu plate, brought out my 5mm tap, and
threaded a perfect hole.
The supplied door closer gas springs (anent "GS 8699-1 2 off")
plus what I call 'pivot balls', came in kit 'FUSELAGE SMALL' according to
my shipping records. You guessed it - the pivot balls won't thread into my
test plate.
I can only surmise that they are of the "fine" persuasion. Can
anyone confirm this? I am only too pleased to discover this anomaly before
I've tapped the 5th and final TG openers.
Ferg
Europa A064
sanding, sanding, glass cockpit and 914 to go
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