in my limited experience this is normal . . I have two 500CM bodies and two prism finders, they both have a bit of "wiggle" don't worry about it, have fun with your new cameras :).
you can buy electric heating mats meant for growing seedling plants . . . I have used them to start seedlings in my basement (with grow lights) for spring planting in the garden. There are also thermostat controls to maintain temp . . . check it out at your local garden supply store . . should...
I still own a Takina Series 1, Bought it with my original Pentax MX . . . used it for over a decade of Aviation and Auto Sports action photography back in the late 70s into the 90s. Now it is paired with my Asahi Pentax K-1000 SE . . . my MX recently was damaged in an unfortunate accident...
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