Re: stem to fit 1.5 in base
You can't really mod the stem, but you can mod the grommet or find one that fits. Mya expandable grommets work great for that. You would want a Khalil Mamoon stem for sure, they are about 1.5" with grommet. MZ's sometimes run smaller sized then KM's so i can't recommend a perfect sized MZ stem but maybe someone else can.