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Spring Steel : Making A Spring For Bolex Crank Handle


Don H Marks

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This is the part I need. Not so easy to find. This image is from a "Sold Out" page. 
bolex-spring-steel-handle-spring-jpg.370

To make the spring I'll use a feeler gauge. I'll heat it red hot so I can bend it. Then I'll polish it and then heat it only enough to turn blue. That will turn it into a spring. 

The original spring measured about 0.3mm, so I used the 0.011" blade from this set. 

 

dsc_0376-jpg.370703

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After polishing with a wire brush (does not show well with flash). Polishing removes the black residue from the previous heating so the color change of the next step is evident.
dsc_0395-jpg.370711

 

Heating just until it turns blue. Now it is a spring.

BTW, when I make parts like this I err on the side of 'just a little too big' as the parts can be filed smaller if needed. In this case it fit just fine, so I left it this size. 

 

dsc_0396-jpg.370712

 

Works gerat! The spring grabs a pin on the side of the camera. Now my handle stays in place!!

 

dsc_0402-jpg.370713

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