yeh no problems there were four changes in the tow shackle or hull extension design that was situated close to the final drive of the tiger 1 tank the first production tiger produced in or around september 42 had the tow shackle design and an armoured ring welded to the final drive seen in the first photo graph below
if you look at the photo you will see there is a peice of steel cut out at the top of the shackle this is the first production as stated. the second tow shackle design had no steel cut out from the tow shackle area and looked very similar to the first this was produced in october 42 see second photo
if you look at the tow shackle area you will see that it is one solid peice of steel also note how the shackle and tow cable sit on the extension. the third design of tow shackle or hull extension was seen in december 42 and had the base of the tow shackle area cut away. this gave the shackle more movement when the cable was applied see third photo
the design stayed like this until january 44 when it was completly changed again and stayed that way until the final production vehicle please see last photo
this last design shows the free range the tow shackle had. now the reason why these were changed was becuase of a couple of reasons the first three were due to feild experience and the tow c shaped tow hooks design which did not vary through the production design. the last production tigers that were produced after january 44 used the panther or tiger 2 designed c shaped tow hook which was larger and fatter than the previous design c shaped tow hooks. this required more movement and freedom to be used effectively hope this helps guys sorry about the photos not real good