RE: Help with Raptor 50 purchase list
Some use the heavy duty switch some dont. I use switched regulators so if the switch fails its irrelevent, its up to you on that one.
The throttle servo doesn't matter unless you are plugging up a governor and doing 3d, any S148 will be fine, if you want to think ahead a little you can get a 3151 but there's no load so the only thing that really matters is speed and how much that matters is up for some debate.
Of all the things you are worried about spending money on, spend the few bucks and get the crank lock, you still have to hold the crank shaft from turning and there's ways to do it with an old tooth brush, string and a few others but the bottom line is a crank lock is the safest proven way to do it and it wont hurt the piston or pre load the engine bearings. Some folks use a rag to hold the fan, the picture I posted works just fine to get it tight so a fan tool is nice but a crank lock IMO is a necessity.