Next on his checklist is wax to stick the feathers together. If the feathers require 166 g of wax and right now he has 20 g how many more grams of wax does he need?
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First, we need to figure out how many grams of wax he needs in total. We know that he has 20 grams right now, and we know that he needs 166 grams in total. So we can say that he needs 166 - 20 = 146 grams of wax in total. 

Next, we need to figure out how many more grams of wax he needs. We know that he has 20 grams right now, and we know that he needs 166 grams in total. So we can say that he needs 166 - 20 = 146 grams of wax in total. 

Therefore, he needs 146 - 20 = 126 grams of wax.