take a paper clip, bend it so one side is pointed out, load the wrist strap [smaller portion] on the tip and push it through, but not too hard or you risk damaging the rubber boot, then holding the strap with your finger on the outside, gently extract the paper clip out and pry the strap [inside] out using it .
from here you have two options, either loop the wrist trap through the small portion and take up the space of a single hole.
or
route it through the second hole by modifying your paper clip by using a needle nosed plier to form a small 90 degree curve and use it to prod the small strap out the other hole from the inside.
hope this helps, cheers:huh: