Centerboard Bashing

I recently purchased a used DS1 and am a newbie to boat ownership. I'm guessing it's a DS1 as it matches the online manuals I've found so far, but I've been unable to find a plate or anything with a boat number or anything other then the daysailer logo on the side. I'm lucky all rigging and woodwork is in great shape, but I'm concerned my CB may need some resuscitation.
When the CB is down it seems to be loose and swings with any side wake, especially at it's mooring. It seems to pendulum so hard i can see the trunk bulging and flexing with it. It's come to it that I'm afraid with enough of this it will eventually flex the trunk and rip itself out. With the CB up the trunk seems supported and that's how i leave it in mooring, but I've noticed it can happen while out on a sail as well. Is this normal, should i be concerned?
Thanks everyone!
When the CB is down it seems to be loose and swings with any side wake, especially at it's mooring. It seems to pendulum so hard i can see the trunk bulging and flexing with it. It's come to it that I'm afraid with enough of this it will eventually flex the trunk and rip itself out. With the CB up the trunk seems supported and that's how i leave it in mooring, but I've noticed it can happen while out on a sail as well. Is this normal, should i be concerned?
Thanks everyone!