Binary counting with 10 bits, and one bit per tape loop. 1/(11 * 2^10). A few good hacks went to the triplex chamber so that counting state transition works with just a gap of bits denoting end of number. The I/O chamber is less compact than I'm happy with (can you imagine a rotating bit-pulling arm instead of tracked one) but hey it's working with one bit per tape loop.

Still curious what kind of chaos led people to not expect primary ties.