GM 12 bolt truetrac help

[Chilly178]

Hi I recently rebuilt my rear axle out of my 67 C10 put in a new true trac pn 913A315 and these holley conversion axles pn 02-119. I put the axles in with the new clips. In the kit with the trutrac it gave me a steel pin and a plug with a C clip. In the diagram for the trutrac it shoes a spacer instead of a pin. Anyways when I went to put the pin in it is kinda tight going in. I could probably get it in if i tapped it with a hammer. I'm not 100 percent certain but I thought it said in the directions that is is supposed to have some axle end play. Is there supposed to be some end play?