The OHMITE rheostats/potentiometers have a few differences from the stock/OEM pots:
— Benefit: They are harder to move and hence are less likely to be accidentally moved during a race.
— Benefit: The resistor coil is exposed, hence easy to clean and vents heat easier*
— Benefit: Slightly more precise than the smaller OEM wire-wound pots.
— Risk: Since the coils, wiper and ceramic base are exposed; damage from a drop can be significant (but overall these are industrial grade and very tough)
— Mounting: The mounting neck is 7/32in and requires a plastic or metal sleeve to fit the 3/8in holes in the PCB. A plastic washer (ID=7/32; OD=1/2~7/16) is needed to secure the shaft to the PCB.
— Knobs: The shaft is 1/8in vs. 1/4in and hence requires new knobs. Koford knobs are available.
M463B annodized black with dot $2.50
e-slotcar.com/koford-variabrake-knob-with-set-screw-and-1-8-post-hole-kof-m463b/
M463A bare aluminum with drilled spot $1.50
e-slotcar.com/koford-variabrake-knob-for-1-8-shaft-with-set-screw-kof-m463a/
*Caveat: Since the pots are not directly in the power-path they don’t actually need to be high-wattage (i.e. do not need a power rating over 5w or Amperage rating over 3A). But the exposed coils of the Ohmites should still be cooler than those in the enclosed CTS pots.
"... get on your bad motor scooter and ride!"
Sammy with Montrose