Hi Paul, I love the detail on your Tiger but of course there is an error, I know because I did the same thing as you with the tow hook pintel, Just like you I took the Heng Long pin and attached a chain to it, but then being nosy I decided to try and find out where the other end of the chain went, I found a German website/forum and someone was asking about towing pins on Tigers, the person replying included some pictures of Tigers with their towing pins and I was surprised to see that the pin was STRAIGHT with the chain clipped to the top by a hole near the top of the pin, the pin then passed through the eye's of the towing assembly and the other end of the chain was clipped into the bottom using a hole near the base of the pin, the pin has a shoulder 1/4 of the way from the top to stop it from dropping through the eye's of the towing assembly, you have no idea how much I swore when I found out, I have been looking for the site where I saw this, I have found the site but I cannot find the particular reference? The site is - Tiger im focus, I hope you have more luck, and now I shall be watching with eagle eye's how your early Tiger 1 turns out

take care my friend. shaun