Talked to another dealer yesterday & he phoned service for us & they mentioned detent as well so being well off warranty we will investigate ourselves. They said detent spring may have weakened & shimming may be necessary. Have talked to a lot of people with this machine & nobody else having this problem. This is the only problem we have had with this unit. We have an extra set of blades sharpened at all times so change them fairly often for a nice cut & I am very fussy about cutting job & you will be hard pressed to find anyone more fussy in the maintenance department either. Other than this issue you will not find a nicer running more user friendly tractor in this size range. We would highly recommend this unit if it is large enough for your purposes. We have a 1972 165 with Perkins gas engine with industrial loader for the big jobs that people offer to purchase when they see it but will never be for sale. The only modification we made to out GC 2300 was to make a stick like the old MF 14 series which we own & are restoring. We wanted more gentle control when mowing around tight areas. This mod leaves the heal & toe pedal intact for large open areas or the stick for real close quarters. If anyone is interested I will try & post pictue of it. It is very simple & convenient & does not butcher the existing parts. Thanks for the replies & any more ideas welcome.