with such an inventive plug it is first seated distally at an appropriate distance within the intermedullary canal and includes a plurality of deformable upwardly oriented leaf springs 490 accordingly with the plug 480 installed in place as shown an even more generalized type of implant and not requiring an actual solid connection to such a distal spacer may be inserted down and into the medullary canal and held in place while resisting distal side to side motion as the distal tip of the implant is retained within these leaf springs 490 this also allows adjustments in a longitudinal direction enabling fine tuning at the effective length of the implant note in fig4 that the aperture through which the implant is inserted is quite a bit larger than that shown in fig4 and in fact does not include a seal per se this is due to the fact that in accordance with this embodiment cement may in fact be injected prior to or after the implant is held in place both proximally and distally indeed according to this particular embodiment a standard distal plug may be used in conjunction with the mechanism shown generally at 404 even without a cap or collar as shown for example this mechanism 404 may simply attach to an existing bone surface or structure instead of the point 409 thereby holding the implant in place proximally and distally while preventing motion in all dimensions as the cement cures regardless of when it was injected in accordance with an alternative methodology the proximal and.