Ecloud Shop EN Piano Tuning Kit Instrument Tuning Wrench Hammer Tools Accessory Set Rubber Felt Temperament Strip

I have a piano with square pegs about 5mm to 5.5mm per side. Would the star tip fit?

Loose end. when i try to tune the string down, the end just unscrews from the handle. has anyone else had this issue? thanks.

I got this thinking it could work on a hammered dulcimer but the head is too big for the dulcimer tuning bolts - can this be modified?

Will the tool fit my Yamaha upright?