For many years I have owned raced on a PK Ripper XL which someone had hacked the dropouts on:-
I bodged some plates up to hold the back wheel sort of in and lived with it spitting me over the bars periodically but recently I found this guy
www.giaengineering.co.uk and took it to him
here is the result:-
He made completely new drop outs and welded them in for £80 which I thought was a bargain
If you ring him tell him Mark put you onto him
DINGO