On Wed, 16 Sep 2020 01:11:16 -0400, Bill wrote:

wrote:
On Tue, 15 Sep 2020 01:11:22 -0400, Bill wrote:

wrote:
I recently bought a lathe. Part of the promotion was an LED light. I
just received the light. Wanting to mount it on the headstock, I
found the holes in the headstock are incorrectly tapped. The mounting
location on the tailstock are correct. I really don't want it on the
tailstock.

The incorrect holes are drilled/tapped M3.5x.35mm. They should be
M4x.70. M3.5X.35 is a "standard" M3.5 fine thread but these things
are unicorns. I haven't found them anywhere, including Amazon,
Grainger, Bolt Depot, and Fastenal.

I've sent the manufacturer an email but have heard nothing. I sent
one with pictures of the problem but it bounced (images are rather
large, so understandable). I resent it without the pictures. Anyway.

1) How to correct?
People with small metal lathes "live for" problems like this.
You could go to hobby-machinist.com and see if their "resources" may
direct you to a bolt source. I feel reasonably confident that someone
there can point you to the right source (do a search first)--though you
are likely to get "Grainger pricing". If for any reason you are not
successful, someone may possibly even be willing to make some for you.
There are some very kind people there just as there are some very kind
people here. I'm sorry I don't own a metal lathe (but maybe someday).
I hope this is helpful.

I don't care much about "Grainger" pricing (though IME they're really
bad). I only need four screws.


Don't write-off hobby-machinist.com too fast. I know someone there (who
I have never met in real life) who I feel quite confident is up to this
task. He works around real machinists by day. There is also a "big
brother" website for hobby-machinist, I forget the name offhand, but it
is not hard to find. If you can provide a specification for exactly what
you want (and it sounds like you are close to that already), then
someone can will surely be able to make it. An amateur may be willing to
do it cheap. To a machinist, a specification is like a contract, and it
shows that you don't want to waste his or her time.

I'll give them a chance to make it right but my email to their
customer service was bounced again today. I meant to call this
afternoon but got busy doing something else.