hello99 and what is Minhag HaMakom — I must take issue with your statement about minhag hamakom in eretz israel is to not wear tefilin. A minhag hamakom means that all the frum jews have accepted the minhag in a community or area. That is the true definition. While if even a many of people in Israel may follow the custom of not wearing tefilin on Chol Hamoed, certainly there are large portion that still wear on CHM. As stated in previous posts there are even several shuls in Jerusalem area where they do wear on Chol HaMoed, as well as the many who do so privately. So even in Jerusalem this claim is not accurate.
Fact is Israel does not as of yet have a minhag hamakom regarding this. People who make this claim are getting ahead of reality and I think you would have a very hard time proving that at some point in history all the jews of eretz israel had stopped wearing tefilin on Chol HaMoed..
Perhaps it will eventually be that all jews in Israel accept this, but it has not happened yet. So until there is a real minhag hamakom where no one wears tefilin on CHM, the posts that state to follow after ones customs are correct, if you wear, do it either at home or in a shul that does this.
Its is a Mitzvah Draita … and I often am confused how one can be forced to change minhag based on Draita , such as on tefilin on CHM in Israel, yet other minhags drabbanan are forced to keep (such as kitniyot)… in both cases I cited there has never been a minhag hamakom in eretz israel, unlike the 2 days of Rosh Hoshana which is a real minhag hamakom for eretz Israel. ( after Hazal made the Calender, Rosh Hoshana was observed for only 1 day in Eretz Israel, for over 1000 years, until the students of the Gra did cause great influence to change this on their arrival, and eventually all the jews of Eretz Israel accepted it, thus we have 2 days here in Israel, based on Minhag hamakon).