[pianotech] Taps from the other side

[John Ross]

Thanks Ron.
I tried to figure out the size and thread, but couldn't.
I do just grind the extra off.
It just seems a shame, we can't get an exact match from the suppliers.
John Ross
Windsor, Nova Scotia

On 17-08-2012, at 12:08 PM, Ron Nossaman <rnossaman at cox.net> wrote:

> On 8/17/2012 1:01 AM, John Ross wrote:
>> What is the size of the screws that goes in brass flanges?
>> When the brass plate breaks the screw does not fit the replacement
>> plate, from Schaff.
>> The screw that  is supplied with the new plate is too long, and the
>> round head isn't right.
>> What tap do I need?
> 
> I don't know, John. It's either a #3, or 2.5mm, and I don't have a thread gauge that goes down that fine, so I can't measure the thread even if I could see the thing. They sure are different threads though, even though the same diameter. A tap wouldn't help anyway, as you likely wouldn't end up with enough thread in the plate to do any good. Can't help with the head, but you could screw the new screw into the new plate with a tad sticking out the other side and file or grind it down to length. Shouldn't be necessary, but there are a lot of things in that category.
> 
> 
>> I seem to have trouble trying to figure out the size.
> 
> So does Schaff, who has a long history of thread confusion. Some of the folks out there might remember their 9/32x36 double helix thread oversize agraffe replacement that wouldn't go into any threaded hole on the planet including one threaded with the tap they sold for them. They never did understand that the threads needed to have been single helix to work, and sold those things at great expense in time and frustration (not to mention damage) to their customers, for twenty years that I know of. I finally bought the last of them just to get them out of circulation.
> Ron N

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