No need, just use a chunk of PVC pipe….. I have about a dozen of them already cut to length ready to go…. I have considered including them with the purchase of a seal puller. If you want one…message me. I have already tried with a 3d printed part, I was not satisfied due to how easily it “could” break, as some will undoubtedly hit it too hard with a hammer to seat the seal, so I stopped. I am sure it could be done, but someone smarter than me, suggested the PVC pipe solution…
http://www.richardsoutboardtools.com
classicomctools@gmail.com