My first 400 day clock.

[dhunter]

I have a Kundo to fix for a friend, their daughter got at it many years ago, twiddled with the shiny balls till the spring twisted up into a pretty helix then broke. A common occurance I suppose. The clock is valued with sentiment by the family and I would love to return it to them cleaned and working.

Based on my measurement I ordered a Horolover .0028"/.071mm suspension spring.
After some reading and research I have installed the spring and set the beat. It runs for hours but at least 10 minutes slow per hour. Balls adjusted fully down. There is a generous rotation overthrow after the tic, of maybe an inch or so.

So have I installed the wrong spring?

Hoping one of the 400 day experts can advise.
Also any idea how old this is, the family is not sure.

I fell confident I can handle the cleaning and lube including the mainspring, just not sure about regulation.

David Hunter

 

[KurtinSA]

It's really difficult to accurately measure these springs. I don't have my repair guide with me, but from memory, 0.0028" seems too thin. I think it's more like 0.0030 or 0.0032". Those with access to the guide can chime in. Kundo's of this variety all take the same spring...fairly common.

Kurt

 

[etmb61]

Hi David,

Welcome to the wonderful world of 400 day clocks!

The Horolovar repair guide shows your clock as plate number 1407B, c1951, and requires a 0.0032" spring. That should get you into the pendulum's adjustment range. Regulating is straight forward, the common recommendation is always make adjustment in only one direction. With Kundos I like to adjust from fast to slow.

The locking mechanism for the pendulum was introduced in 1954 so your clock was probably made later than that. It might be helpful to see the bottom of the base and how the dial is attached to get a better estimate.

Eric

 

[TQ60]

Your clock is post 51 or so due to the narrow plate.

Call it legal tax evasion as there was an import tax on clocks (wide plates on older ones) or watches or alarm clocks (something with narrow size)

There are some with narrow plates and wings added to return the large look.

Too lazy to look at book but others identified likely correct suspension.

Look for old cigar tunes as they are great for storing the suspensions and keep broken ones as sometimes can be used for shorter clock as common to break just at the end and often can still be used.

You could try moving the fork a tiny bit to alter the power transmitted just for fun as these are not the best time keepers anyway.

Best to get correct one if you can.