I notice a lot of the smaller engines like 21 to 24cc have only two bolts to bolt down the cylinder. Engines like Shindaiwa T231, Redmax 2501, Tanaka 21cc and Echo 21cc etc. all have only 2 bolts. Any issue of the cylinder mount crack and ruin the engine? I would think those use 4 bolts will spread the force to all 4 corners and less stress on the metal which is very brittle.