Removable tail flap.

ferniesnow said:

The factory punch marks are different on the '17's and '18's. The marks on the '18's work for the removable tail flap. The marks on the '17's are not for the removable tail flap (see Norona's post above). On the '17's one has to measure, centre punch, and then drill. The '18's are drilled just where the marks are from the factory.

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