A simple thread question for the experts

[Parker3865]

I have been translating a parts manual into English (MS word online does the translation!) for a friend with a Morini 175 (a very early one I believe). The Machine screw sizes are MA. I guess the M is metric, I wondered what the A stood for?

[davel182]

Probably more chance of an answer in "Pre V Twin models" - this is "Lambertini era singles (125 and 250 - half v-twins)".

[Parker3865]

Thanks, I'll put it there.