Hi Jesse:
I am using a 1/2" x 5" x 36" oak base for a Revell 1/72 U Boat and a pair of 1/4" x 3 1/2" machine bolts with hex heads to act as supports. The shaft is bare polished steel about 2 1/2" long. Other lengths are available and I believe brass is also available.
I drilled out 1/2" x 3/8" holes in the underside of the base(this hides the bolt heads) and inserted the bolts from underneath,making sure they are absolutely vertical, and then screwed them into nuts that I had embedded in the keel (from the inside) and glued in place with Le Page Universal Adhesive which is a super glue.
To make sure the nuts were properly lined up, and therefor the boat ,I screwed them on the bolt heads (that I inserted through holes in the model bottom)and 'tacked' them in place with crazy glue. Once alignment was confirmed I used the other glue to lock them in place and set everyhthing aside to dry.
After inserting the bolts through the base and screwing them into the boat keel nuts, I pressed the hex heads into the base holes by placing the base on a flat surface and pressing down. A retaining strip of metal can be screwed in place if need be to make sure the bolts stay in place.
I've used this approach on several models and it works for me.
Hope this helps.
Stan Goddard