Dave, if you don't want to buy a new tool, I would use the same procedure like when I used to replace my own shocks (back before struts) and you tighten things down to cause the rubber to start to expand, then STOP. This is probably the same principal for the smaller rubber grommets with these valve stems. The expansion of the rubber implies the seal it is trying to provide for its intended job, but you don't need much. Hopefully LonnieB can check my commentary to make sure I describe it correctly in the event you aren't near your tire guy or don't have the right tools.
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