Anyone have some ideas about what to do with those odd screw sizes engine manufactures use? I have O.S. and GMS engines. Some screws are like m2.4, m2.6, or m3.2. I cant even find any manufactures online that sell those sizes. Lest I be stuck paying $2 a screw from the manufacture. Is it better to retap the engines to a more common screw size? Or learn an expensive lesson and dont buy engines that require exotic parts?