Tuesday, September 27, 2011

Molla per parastrappi

In an earlier post I wrote about the broken "cush drive" springs. Apparently my parts book calls them: "Molla per parastrappi". I didn't find anyone local selling applicable replacement springs. But I did find these guys have a good online catalog:

And they were quite helpful with ordering the springs. The minimum order was a pain ($40), but that is survivable.

Essentially, there tech rep said engine type springs, like valve springs, have a high grade finish with less pits etc. A spring like that will require special ordering of a zillion units. That is out of my budget for this.

I ended up ordering a couple sets (ordered 16 to get to the $40 minimum order) of a standard "music wire" springs. Might be OK in my application in the rear hub. They are unfortunately powder coated, but that rubbing off shouldn't be too detrimental in the sprocket area.

The ones I ordered are specified as Length:63.5mm, Outside Dia: 15mm, Wire Diameter: 3mm, Number of coils: 12 (total 14). I actually ordered 2 types, the ones closest to that size. I'll see which fit best.

I have a lot of spares so if you need something like this contact me!

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