How old is your Lubitel? (it's first 2 digits of serial number, and you can find serial number at the bottom of your beloved Lubi)
Where did you get it and when?
And is it Lubitel 1, 2, 166, 166B, 166U, 166+?
I have Lubitel 166U, from '84 and I got it in February this year for only 35$ from local guy who sells vintage cameras