It's not really the role but my questions - and comments like Mac's...
Believe me, Lewis, no-one has really wanted to put your problems and thread off-topic - but you need to be clear when asking and if you cannot be clear (as you may be a beginner not knowing what may be important), at least answer when people want to clarify the situation.
(Honestly, we still do not know for sure whether your problem comes from inaccurate use of the SketchyPhysics plugin - no matter how many times I asked you to let us know)