Fig. 1From: A self-adjusting head holder without ear-bars for guinea pigsStages of the mouthpiece manufacturing. a Blank; b manufactured mouthpiece. 1 Grooves; 2 hole for incisors; 3 obround hole for attaching the bolt that controls the distance between distal ends of the snoutpiece and mouthpiece; 4 and 5 holes for the bolt that controls head-holder opening (4 has a 3 mm diameter, 5 is supplied by 3 M thread; 6 hole for the bolt that attaches mouthpiece to snoutpiece. Scale bar = 10 mm. Inset front view of the distal end of the mouthpiece. α, β Angles of the grooves; γ angle formed by medial walls of the grooves (ridge)Back to article page