I always hate when people reply to a question I've spent time on with "have you tried Google?" I mean, duh...
But I wonder if you've tried contacting Pentax repair businesses to see if they sell parts. Perhaps you can mail order something?
I found these on Google:
Pentax Camera Repair Specialists - Harrow Technical ,
http://www.asahiphoto.co.uk/Spares.htm
And this one:
Genuine Pentax Replacement Parts from USCamera.com (scroll down; there is a "counter dial cover" listed as part #
23704-C312).
Hope that helps. (I didn't even know the counter cover came off!!
)
And welcome to the forum -- enjoy your K1000.