[MakeLV] Replacement magnetic reed switch for bike computer?

[Randy Kramer]

Has anyone here ever picked out a magnetic reed switch to use as a replacement 
for a bike computer (i.e., electronic bike speedometer / odometer ...)?

We have two bike computers that are non-working because the reed switches have 
died.  (Both due to impact, they no longer switch, they're stuck in one 
position.  I've tried tapping them fairly hard to get them to operate again, 
but no luck.)

I'd like to buy an off the shelf reed switch and solder it in place of the 
original.

If anybody has done that, do you have a reed switch you'd recommend?

If not, I did a little bit of looking.  The reed switch in one of the speed 
sensors is about 1/2" long.  I found a reed switch that is 1/10" (diameter) 
by about 1/2", so it should physically fit.

Here is the switch I found:

SWITCH,MAG REED,SPST-NO 0.5A at 100VDC. JAMECO VALUEPRO MKA-14103-1015-R
 
http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_171872_-1

and a link to the data sheet:

http://www.jameco.com/Jameco/Products/ProdDS/171872.pdf

I can't copy and paste from that .pdf, so I'll mention a few things:

The battery operating the computer is (depending on the computer) either a 3.2 
or 1.6 volt button cell. (2032 or 2016).  Thus, I'm sure the voltage at the 
reed switch is no higher than that (it could be, I haven't measured it, but I 
doubt it is any higher).  So, I need contacts with low contact resistance.

I don't need high current capability.

I do want good resistance to mechanical shock.  This one is rated to withstand 
1 msec. shocks of up to 150 g, and sinusoidal vibration of 1 to 2000 Hz. at 
20 g.  Sounds likely to be tough enough.

Any comments, other suggestions?

Thanks!
Randy Kramer