I need Flat tips for a couple of dial indicators used to set up my jointer and planer. I looked in local stores and the only place that had them ,it was $60 for a carbide flat tip. This is more than I paid for one of my indicators. Next I went online and found the $7-10 ,22 piece sets. Perfect,then figured out there are metric threads and 4-48 threads. I have a Mitouyo gauge and a cheap one have no idea which thread type to order. Leaning toward the metric threads can anyone help me here ? Any other sources for tips ?