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GRUEN cal 450 Timer [message #15299]

Wed, 28 July 2021 19:50

mikeo1
Messages: 2
Registered: July 2021

Gruen Apprentice

Hello All-

I am trying to restore a Gruen Chrono Timer (cal 450) and need just 1 more part-

a hammer return spring--it's at the 2 o'clock position

/vgforum/index.php?t=getfile&id=8412&private=0

/vgforum/index.php?t=getfile&id=8412&private=0

/vgforum/index.php?t=getfile&id=8413&private=0

I'd certainly appreciate a hand; i'll buy a parts movement if necessary; I'd like to breath a new
life into this guy and share pics when I'm finished

THANKS-Mike

Attachment: gruen-chrono-timer-pulsation.jpg
(Size: 48.56KB, Downloaded 1461 times)
Attachment: spring.jpg
(Size: 808.30KB, Downloaded 1381 times)

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Re: GRUEN cal 450 Timer [message #15300 is a reply to message #15299]

Wed, 28 July 2021 21:19

Gary
Messages: 2189
Registered: May 2013
Location: Seattle

Gruen Authority
Cheerleader

Mike you could try to make your own, no risk in trying...

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Re: GRUEN cal 450 Timer [message #15301 is a reply to message #15300]

Wed, 28 July 2021 22:17

mikeo1
Messages: 2
Registered: July 2021

Gruen Apprentice

Hello Gary-

Thanks for your reply--Did you just offer to make the spring for me Smile

?

Actually I tried to make the spring located at 7 o'clock but found that I given the length I could not get the tensile just right for correct hammer
operation-too strong button was over powered, to weak and return was partial-wound up finding one. I suspect there will be a tensile issue
on this one as well. For me proper running of chronographs always seems to be a matter of spring pressures and eccentric screw positions.

Still hoping to find one!

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Re: GRUEN cal 450 Timer [message #15598 is a reply to message #15301]

Wed, 06 October 2021 18:46

JackW
Messages: 1991
Registered: May 2013
Location: Denver

Gruen Authority
Head Janitor
Site Admin

This part is currently listed on eBay - https://www.ebay.com/itm/133896107271?hash=item1f2cd47507:g: c8sAAOSwSxdhXPtu

I've no connection to the seller.

All I know is based on hard work & writing by others. I can only aspire to augment this body of knowledge. If I am wrong it is because of my own failings. -me

"If I have seen farther it is by standing on the shoulders of giants." - Newton

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