11-03-2019, 04:50 PM
About 5 or 6 ohms should be enough. I made a "Heath Robinson" one for my RP which (earlier) had a 35M dyno. Just wind some resistance wire around a pencil and fasten in between the two terminals. Leave it in the wash from the fan to keep it cool. Trial and error to get the right level but it's a cheap enough fix. Resistance wire from Maplins or the Bay of E.