Once we tested mechanical properties of individual mouse vertebrates, the shapes are difficult to control in mechanical properties.

We were attaching each end of vertebra to a squared plastic piece (cut from plastic weighing boat, normally every lab has) with a bone cement at each end. In that case, vertebra was sandwitched between plastic pieces. That gave good control of handling of vertebra. Than crushing the the plastic sandwitch for mechanical properties. Hope I understood your question well and the answer helps you.

Cellulose and protein are more slippy. Any anti-carb or anti-protein reagent can be helpful. Consult with a Biochemist/Chemist.