Good morning OOW
Why are you asking about Delam, when by your own admission you dont know what it is, the only sound advice I would suggest is to seek out the service of a good engineer.
If you are just asking then it is very difficult for anyone to give youi sufficient information by reading here on this thread, the engineer is THE ONLY SAFE ROUTE.
IF HAVE ANY DOUBT'S about your Enstrom PLEASE do not fly it until it is checked out
WE do not want to read about any accident with any helicopter if it can be avoided
Peter R-B
Vfrpilotpb