I have discovered this a few months ago when installing new EOS's on Spy Hunter. I was measuring the resistance of the old switches and went to compare them to the new ones. I was very surprised to find the new switches had a higher reading. 12 to 15 ohms, which is way too high. I cleaned the contacts with rubbing alcohol and got them down to .2 to .5 ohms which is acceptable. You also want to make sure that the tension is tight against the contacts by bending the leaves slightly towards each other to make them tight.