We have a Fowler digital drop indicator mounted in a granite stand. The thing started acting up so I just want to replace it with a Mitutoyo. The problem is it's mounted with a lug on the back. I can't find a mitutoyo with a back lug mount. They're all flat back so I assume you mount them on the stem. I know with some you can replace the flat back with a lug back but you can't with the ones I'm looking at. Is there an adapter or something available to go from lug mount to stem mount?