That is normal. You need a bolt and nut for the fourth mounting point. Lowe’s, Home Depot, or any hardware store should have it.
Measure the length of the mounting point on the fourth leg and the length of the engine mounting point you chose. I forget the length, but I believe a 100-120mm bolt should be long enough. Make sure the nut and bolt have the same thread pitch (such as m12x1.50)
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