I bought both sizes of spark plugs to adjust the gap. However, the main reason I bought them is to lock the charging handles on two grease guns. Pull the grease gun charging handle out until you feel a slight resistance equal to the amount of grease remaining in the gun. Attach the tool to the fill rod behind the barrel of the grease gun tube and the grease will not migrate past the piston if the gun has not been used for a long time. If the grease hoses are left in the grease gun for a while, the constant spring and plunger pressure starts to get the grease bypassing the plunger to the back of the gun barrel, and it gets wasted and messy when you pull the charging handle all the way out to replace. with a new tube of grease. I have two grease guns and will be using both of these tools in my grease guns, a great product that actually has three great uses in the automotive trade. I hope this helps many people. Sincerely, William Reid of Virginia.
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