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If that mold doesn't work out how you want there's another way of doing it that I have seen some local blokes use - If you know anyone with a 3D printer who is handy at designing (or can utilise a 3D scanner) you may have some luck getting a nice mold done that way, which you can then fill with...

Picked up a nice little quarter inch breaker bar to go with the short 90-tooth ratchet: More pics here: https://motofaction.org/tool-reviews/nepros-nbs2l-long-spinner-handle-breaker-bar-review-6-3mm-1-4-inch-quarter-japanese-made-japan/

Welcome!

Take a look at pics 7 and 8 here: https://motofaction.org/tool-reviews/dawn-5sp-5-inch-vise-vice-used-restoration-review-information-history-australian-made/ Handle | Washer | Dynamic jaw | Washer | Spring | Washer | Cotter pin You should have to compress the spring a little to be able to...

If you haven't already seen it there's a bunch in this 1924 catalogue: https://archive.org/details/WaldenWorcesterWrenches1924 Can't help with pricing but thought it might be interesting nonetheless.

The ZEAL range includes semi-deep and deep sockets as well as the super shallow ones, if you wanted to stay with Koken but diversify the socket sizes...

Google Translate says that the characters within the rectangle are Made In Japan... for what that's worth!

Wow, that's quite a find. Very nice.

Picked up some nice Ko-ken extensions last week - a review: https://motofaction.org/tool-reviews/koken-ko-ken-extension-bar-set-review-pk3760-6-3-8-inch-9-5-mm-made-in-japan/ Got another few Dawns in to clean up, just haven't had the time to get to them lately...

Picked up some extensions with some verrrry nice knurling: Pics and thoughts here: https://motofaction.org/tool-reviews/koken-ko-ken-extension-bar-set-review-pk3760-6-3-8-inch-9-5-mm-made-in-japan/ Leaves my Taiwanese-made ones for dead. Such a remarkable difference in how loosely they fit...

Very impressive work.

I have used mine way more than I expected. Video:

Welcome from the other side of the continent!

For working in cramped spaces I really appreciate my Nepros 90-tooth. Otherwise I like using some low tooth count ratchets that are older than I am... tooth count doesn’t mean much when you’re swinging in open air!

Welcome!

Kept all of the bolts from disassembled/parted out engines and frames over the years if they were of good quality and undamaged... added up to rather a lot over time. Most others bought from fastener shops, they’re really quite inexpensive compared to buying from the big name hardware stores...

I use a Warren and Brown 1/4” deflecting beam wrench: https://motofaction.org/tool-reviews/warren-brown-1-4-deflecting-beam-torque-wrench-320510-320500/

Welcome!

Colour me interested! Is that the 1936 patent application you're referring to?

There's some more info on JIS here with images of the differences: https://motofaction.org/mechanical-101/a-what-is-jis-screw-difference-phillips-different-vessel-keihin-carbs-cross-head-japanese-industrial-standard/