Wonder what tips friends here may have for making a switch to an instrument with a different mensure than that which one's hand is accustomed to. Background is this. Over the last few years I have been better at acquiring basses than at disposing of them (much to wife's consternation) - the result being that my house is fairly littered with double basses. I try to help justify this by keeping at least two basses in active practice and play, set up differently for differing musical applications. My main classical bass I am very pleased with for now. But I am very keen to retire my other "first-line" bass to the "someday I'll get around to selling this" list, and promote a more recently acquired instrument to become my main pizzed, pickup-equipped jazz instrument. The new candidate, a flatback, has a HUGE, warm, woody sound which will work very well in a jazz setting. Problem is, this bass has a mensure which is around 1.25 inches greater than my other basses, at least one of which I intend to keep in active use. In the past I have always tried to stick to a constant mensure to avoid this very problem. Bought the longer one 'cause the sound was soooo killer. BTW, I don't really want to consider the modified nut trick. In considering switching to play on different mensure, the easier question would be a permanent transition. This is essentially the same topic of two other threads in recent weeks, concerning intonation training, so no need to reiterate those good ideas here. The trickier question is simultaneous active practice and play on two basses with differing mensures. Anyone have any tips on how to effectively train the mind and the left hand to move back and forth from one bass to another, day in and day out, and still feel at home (and in tune) on both ? Has it just worked for you without any special effort other than ample practice time on both instruments? Or is this just asking for trouble ? Very curious to hear of other's experiences and thoughts on this one. Thanks.