Hmm that link doesnt answer the question about wether lapping the TEC is reccomended or not.
As for the patience, there had been 6 views and no responce.
Be happy it had 6 views and no posts.. it means if people didn't know they didn't answer...
As far as the link it DOES answer your second question. However there should not be an issue with lapping a Peltier effect cooler, the copper block should be fine, just don't remove all of it.