On 25 Feb 2023, at 5:02 am, Wayne Tarling via <tarlingw@...> wrote:

I've had to step away from this project for a few days.

Thanks, I actually have a very similar set of very fine diamond tools like this, but much thicker than the 0.007" you show.? ?Unfortunately, the switch assembly must be removed in order to reach these contact positions .....something I would only do as a "last resort".? ? But thanks for this info. 0.007" is into the "feeler gauge" thickness.

On Tuesday, February 21, 2023 at 08:34:17 AM PST, Michael Casino via <michaelcasino@...> wrote:

You might want to try a

Jonard OB-1/3 Burnisher with Black Plastic Insulated Handle, For Fine Contacts

Amazon:

Unfortunately I haven't had any success with this switch combination.

I have applied a switch cleaner without any success.

I have found that there is very little contact pressure on these switches to begin with.

I came up with a way to attempt to "clean" the contact surfaces in addition to just "wetting" the surfaces with a cleaner.

I have found a business card (0.26mm) that has a "rough surface" (as opposed to a glossy card) and absorbs cleaner freely. Cut it up (shaped) to be able to slip between the contacts (when open), then closed the switch, soaked the card with cleaner, and wiggled it around, trying to rub the mating surfaces.

I got the manuals to work better, but not the pedals.

There is no way to actually "see" the condition of the contact surfaces.? Many questions arise:

1) is there any corrosion?

2) is there any contamination of any type?

3) how much contact is actually taking place on each of the five "springs"?

4) are each of the five "springs" providing exactly (or close) the same amount of contact pressure?

5) "which" spring or springs are NOT making contact?

It is the last point that has me thinking it might be a prudent step to remove these switches from the circuit and test for continuity to be able to know which one(s) are contacting which are not in order to know which to work on.

Thoughts?

Is there a better way to check or clean?

Having looked at the switch assembly, I believe I can remove the entire assembly and put in on the bench. It will be a fair bit of work, but very doable.

What do you think is the best way to proceed?