VIDEO: A plan to transfer part of Des Moines teachers' pensions into the Iowa Public Employees' Retirement System this summer hit a snag that could derail the merger, at least for now. The cost of transferring about 260 current Des Moines employees who are part of the Des Moines Teachers Retirement System would be too much, according to district controller Nicholas Lenhardt. "We’re terribly sorry that this has been a roller coaster of an experience; we did not intend to continue to jerk (people) around," he said to about 200 people at East High on Monday.