What kind of switch is this?
maybe this
It is a solid switch, measured resistance only 5 mohm.
By the way as I see, the resistance of the tailcap depends mostly on the pressure spring.
Some resistance measurements, all done with a 4 terminal ohm meter (Resolution 0.01 mohm):
| JetBeam M2S Tailcap | 70 mohm |
| ThruNite TN11 Tailcap | 85 mohm |
| 4Sevens Quark X AA2 Tailcap | 82 mohm |
| Fluke 289 10A range | 33 mohm |
| Fluke 189 10A range | 55 mohm |
| Fluke 179 10A range | 35 mohm |
| Vichy VC99 20A range | 48 mohm |
| Best DT9205A 20A range | 18 mohm |
| Fluke test lead (x1) | 38 mohm |
| Fluke test lead (x1) | 51 mohm |
| No name test lead (x1) | 257 mohm |
| No name 10A test lead (x1) | 22 mohm |
Both test leads and DMM's has connections included in the resistance (one for lead, two for DMM).
The Best DMM is unfused, that is the reason for the low resistance.
Remember when using test leads, that the resistance is included twice, one for each lead.
Doing a test with 10A current and measuring the voltage from test probe tip to test probe tip:
| 10A | Tot. Res | |
| Fluke 289 + Fluke test lead | 1.02 volt | 102 mohm |
| Fluke 189 + Fluke test lead | 1.16 volt | 116 mohm |
| Fluke 179 + Fluke test lead | 0.97 volt | 97 mohm |
| Best DT9205A + No name 10 test lead | 0.59 volt | 59 mohm |
The connection resistance from test probe tip to current source is not included.
It seems I've been underestimating the tailcap resistance indeed.
And the above values don't include the thread connection, do they?
SC51 is IMO very prone to this.
You can actually notice from the lack of lumens when it does this.
I use Nyogel. Maybe I should run it dry from lubes.
My measurements are without any connection resistance. Two of the tailcaps has visible springs and I did connect as close to the tip as I could.
Tailcap to body resistance will be very low if the metal is clean. A LD01 SS body to head connections is below 1 mohm (This is a SS to SS connection, not aluminium).