Need eyecup for pentax spotting scope....

[lazylabs]

I have a pentax spotting scope that I really like with one exception. The eye piece has a hard flat plastic piece that doesn't allow you to form a seal around it. It is rather hard on your eyes with nothing to seal the outside light out and makes my eyes water after about 10 min. SO do any of you guys know of aftermarket eyecups that I can add to my scope? I contacted Pentax and got no response, I have emailed a few of the optics dealers and also found nothing...... any help?