the inspection hole is a good idea at the pitot tube . my wings were covered in 1992 and they were installed for good on the plane in 2008 . after the instruments were installed , i did a pitot check and the system would not hold any pressure . came to find out that the surgical tube that connected the metal pitot tube to the poly pitot hose had rotted over the years . luck for me they had installed a inspection ring in the area of the pitot tube .