Seeking help/advice on my D/fly gearbox problem. Have owned bike, and ridden it, for around 40 years but have never been able to sort out problem with gear change. Box has always been noisy and 'crunchy' when changing down gears, and also to some extent when going up the box, but is now at the stage where it is really uncomfortable. The only way to get a clean gear change is to forget the clutch and go 'clutchless'.
I've stripped the box, checked all the gears for wear, replaced any suspect bearings, different oil grades and levels,made sure all fasteners are tight but without success. The clutch works perfectly, with no drag when lifted. With the bike on the stand and a gear selected the rear wheel can be spun by hand with the clutch lever lifted, so can't imagine a problem in that respect.
The only thing I haven't done is to try new selectors. Could this be the problem. When I stripped the box I couldn't find my spare pair to try, and then realised I'd sent them some years ago to a club member for re-furbishing, and didn't receive them back. Trouble is I can't remember who it was.
Would appreciate any help or advice. Merry Christmas to all, and Happy New Year.