About this deal
If you enjoy building ship models that are historically accurate as well as beautiful, then The Nautical Research Guild (NRG) is just right for you.
I've acquired a few pin pushers of various sizes over the years at garage sales and the like and I occasionally use one, but a more versatile and more easily controlled solution, as Jaager sagely notes, is a pin insertion plier. The Guild is a non-profit educational organization whose mission is to “Advance Ship Modeling Through Research”. We provide support to our members in their efforts to raise the quality of their model ships. I bought a pin pusher (see pic), but I think the internal diameter is too big for the pins supplied in the kit. Yes, you've correctly identified your problem. Pin, or brad, "pushers" are made in a variety of sizes to fit the brads and pins they are intended to push.