Don't get caught out! I started to replace the my sparks plugs today and noticed Mr. Piaggio had kindly fitted an allen bolt on the casing so close to the spark plug that the toolkit spanner would not fit.
Not the greatest of problems but very annoying if you were at the side of the road! I sorted the problem by thinning down the side wall of the plug spanner. Whilst the plug was out you could remove the allen bolt and thin the head down its up to you.