module StrapMountBolt(l_delta){ ///toplevel
// positioned relative to smc_pos
translate([(smc_bolt_nut_eff_thick - sm_bolt_head_thick)/2,
module StrapMountBolt(l_delta){ ///toplevel
// positioned relative to smc_pos
translate([(smc_bolt_nut_eff_thick - sm_bolt_head_thick)/2,