That's a good tip about screwhead types....need to remember that!
Anyhow, the Yokomo screws are crap! Through the numerous vintage models I've rebuilt, I've found Kyosho screws to be the most durable!
The Yokomo ones are rubbish....with my kits I replaced 95% of them with stainless steel BH or countersunk screws. They look nicer and are easier to maintain.
If the Car is old and hasn't been used, I'd recommend using some lubrication and letting it settle for a few days e.g. WD-40 or GT85.
If you completely knacker the screwhead you'll end up having to dremel and drill the screwhead...can jeopardise the chassis! If you think there is thread lock, apply some heat (e.g. through a soldering iron) to help soften it.
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