Simga 70-300 APO + Sigma 1.4x convertor On Nikon

When I bought my sigma 70-200 & x2TC I wanted to stick it on the 70-300 I had before I sold it. It wont work, the rear glass element on the sigma lens makes contact with the TC before you can lock the 2 together, this is the same for the x1.4tc.
 
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