Well:
1. They are big screws, chosen to minimise the risk of stripping the threads they cut into the nylon of the gearbox and suspension mouldings. Making them out of any kind of steel would mean more weight. Back in the day, weight really was the enemy, as the batteries of the time were just 1200mAh, while the races were still 5 minutes.
2. Stainless steel screws in an alloy chassis will result in electrolytic corrosion of the chassis.
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Currently:
Procat - 20 years since it last ran
XK98 - 12 years since it last ran
XRAY T1 - 3 years since it last ran
X10 - Ebay purchase
X11 - Ebay purchase and rebuild Project
DEX410 - 2 weeks since it last ran
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