Daniel,
What's a "pseudo masuyama"
I know only too well what a Masuyama is - I used to have a full set of them! But I've never heard of a "pseudo" - maybe a five element plossl??
I have one of those cheap no name 25mm plossls - its about 15 years old, and the barrel is slightly out of round, you cannot see this, it is only apparent when you push it into the holder that it is a little tight.
Yours for the cost of postage if it is of any use.