Springs for HP-41 battery holder

[Jurgen Keller]

Does anyone know a source for replacement springs for the HP-41 battery holder? I have a few holders with broken springs.

   

[Dave Frederickson]

(02-10-2018 03:49 PM)Jurgen Keller Wrote:  Does anyone know a source for replacement springs for the HP-41 battery holder? I have a few holders with broken springs.

These look pretty close.

https://www.alibaba.com/product-detail/S...50a7ij5NBt

BTW, someone is already looking into samples and a minimum buy.

[Jurgen Keller]

(02-10-2018 03:52 PM)Dave Frederickson Wrote:  

(02-10-2018 03:49 PM)Jurgen Keller Wrote:  Does anyone know a source for replacement springs for the HP-41 battery holder? I have a few holders with broken springs.

These look pretty close.

https://www.alibaba.com/product-detail/S...50a7ij5NBt

BTW, someone is already looking into samples and a minimum buy.

Thanks for the link! I just found an offer on TheCalculatorStore:
HP41c battery holder spring

A bit more expensive then the Alibaba offer. Maybe TheCalculatorStore offers volume discounts? :-)

[smp]

(02-10-2018 03:49 PM)Jurgen Keller Wrote:  Does anyone know a source for replacement springs for the HP-41 battery holder? I have a few holders with broken springs.

Here's a link to TAS:

https://www.ebay.com/itm/Spring-for-HP41...Sw9NBabEo5

EDIT: The price is not too bad, but the shipping is outrageous...

smp

[Jose Gonzalez Divasson]

I am not a TAS expert, so I had the setting by default...

I have fixed it now. Combined shipping.

José
The Calculator Store

[Gerald H]

€ 10 postage & + € 10 for each additional unit in EU doesn't seem reasonable.

[Jose Gonzalez Divasson]

Fixed. Now is 10€ for any number.
Had only fixed the EU price - not overseas.

[Jurgen Keller]

(02-11-2018 09:39 AM)Jose Gonzalez Divasson Wrote:  I have fixed it now. Combined shipping.

Thanks a lot, Jose. I just placed my order directly via TheCalculatorStore. I needed a few other parts and in the end shipping cost was EUR 8.26. That's very reasonable.

[Sadsilence]

Another idea I personally use:

AA battery holder

When disassembled with wire cutter correctly you get 9 (single) springs with natural "tails" for soldering together. That are 4.5 pairs for 99 (euro) cents and of course a little but easy soldering work. Successfully tested with HP-25, HP-19 and HP-41 battery packs.

[Jurgen Keller]

(02-11-2018 12:52 PM)Sadsilence Wrote:  Another idea I personally use:
AA battery holder

That seems to be a good and cost effective alternative, thanks for the pointer.

[Dan Grelinger]

I received some replacement springs from a 3rd party source several years ago. I was warned that they were stiffer than the original springs. Be aware, the battery contact block is held in place by the top two case screws, which suffer from a screw post design weakness. Using stiffer springs 'may' result in more stress on the screw posts, leading to earlier failure.

[Jurgen Keller]

In the meantime I received the springs from TheCalculatorStore. In my opinion, these springs are good replacements. The only minor difference I noticed is that they don't look as "shiny" as the original ones.

I also ordered the "Lower Post Repair Part" and used it to repair a Halfnut HP-41. Up to now that's the best and probably most sustainable repair method I know of for the front posts. There is a detailed description of the repair process, it's easy and fast. The part is not cheap, however, I think it's worth the money.

I very much appreciate Jose's efforts to provide repair parts for the HP-41 calculators. The HP-41 plastic parts get more and more brittle. At some point we will be in need of replacement cases as well (favorite "color" would be transparent) ;-)