* -er > -ër

Even we know that short PIE *e yields in Alb. /ie/, in certain
circumstances, it simply becomes /ë/, like *ma:ter > motër 'sister',
but motërmadhja 'grand-mother', *g^enH-ter > dhëndër 'son-in-law,
bridegroom', present also in Romanian dandar 'foriegn', if I am not
wrong. So, in consonantal group *-er > -ër, in both dialects.
But, I like to point out some onomatopoeic verb, especially
<dërdëllit> 'to murmur', derived from reduplicated form of PIE *der-,
which underwent the dissimilation in distance r - r > r - ll.
It probably was caused by the need to avoid too murmurings, giving to
words some liquids. Any suggestions by Jens?

Konushevci